CLN: Remove python2-style longs in regexes
- [x] xref #25725

Minor cleanup: Cleanup some regexes that guard against python2 style longs in their error messages.
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=h1) Report
> Merging [#26337](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ee6b1318ff07806ead79dac8119ad9ce580afe1c?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/26337/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26337      +/-   ##
==========================================
- Coverage   92.04%   92.03%   -0.01%     
==========================================
  Files         175      175              
  Lines       52297    52297              
==========================================
- Hits        48137    48133       -4     
- Misses       4160     4164       +4
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.59% <ø> (ø)` | :arrow_up: |
| #single | `40.72% <ø> (-0.15%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/26337/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `78.94% <0%> (-10.53%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/26337/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.01% <0%> (-0.12%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=footer). Last update [ee6b131...1fb577d](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=h1) Report
> Merging [#26337](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/681a22c154b84659e90507f7727dbec5cd65d01d?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/26337/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #26337      +/-   ##
==========================================
- Coverage   92.04%   92.03%   -0.01%     
==========================================
  Files         175      175              
  Lines       52292    52292              
==========================================
- Hits        48132    48128       -4     
- Misses       4160     4164       +4
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.59% <ø> (ø)` | :arrow_up: |
| #single | `40.71% <ø> (-0.15%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/26337/diff?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `78.94% <0%> (-10.53%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/26337/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.01% <0%> (-0.12%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=footer). Last update [681a22c...42e7301](https://codecov.io/gh/pandas-dev/pandas/pull/26337?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 The failures are unrelated: 

```
Exception: Cython-generated file 'pandas\_libs/algos.c' not found.
                    Cython is required to compile pandas from a development branch.
                    Please install Cython or download a release package of pandas
```
 @topper-123 : The issue actually traces to `conda` being unable to create the `pandas-dev` environment that we use for testing:

https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=11274 (this is for your PR)

Not sure why Windows is not liking the YAML.  It hasn't been touched since end of March. Ok, I'll push again, maybe it was something intermittent on the servers. No, already failed. Strange... looks ok; waiting on resolution of CI issues. This passes now. thanks @topper-123 