CLN/DEPR: removed deprecated as_indexer arg from str.match()
- [x] closes #22316
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

This is the renewal of #22356, as the git got tangled up I re-forked the repo.
Hello @HyunTruth! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/core/strings.py`](https://github.com/HyunTruth/pandas/blob/1bc05c298c8df1e7834ab91a86e204d2dbf001fe/pandas/core/strings.py) !

 - There are no PEP8 issues in the file [`pandas/tests/test_strings.py`](https://github.com/HyunTruth/pandas/blob/1bc05c298c8df1e7834ab91a86e204d2dbf001fe/pandas/tests/test_strings.py) !

 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22626?src=pr&el=h1) Report
> Merging [#22626](https://codecov.io/gh/pandas-dev/pandas/pull/22626?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/14ccdd22f158b7944a403e02082402bc85fb11a5?src=pr&el=desc) will **decrease** coverage by `<.01%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/22626/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/22626?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #22626      +/-   ##
==========================================
- Coverage   92.04%   92.04%   -0.01%     
==========================================
  Files         169      169              
  Lines       50782    50778       -4     
==========================================
- Hits        46744    46740       -4     
  Misses       4038     4038
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.45% <100%> (-0.01%)` | :arrow_down: |
| #single | `42.27% <66.66%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/22626?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/strings.py](https://codecov.io/gh/pandas-dev/pandas/pull/22626/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc3RyaW5ncy5weQ==) | `98.63% <100%> (-0.01%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22626?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/22626?src=pr&el=footer). Last update [14ccdd2...a95baf7](https://codecov.io/gh/pandas-dev/pandas/pull/22626?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Did the small change, thanks a lot @HyunTruth ! Thanks @jorisvandenbossche!