COMPAT: add 0.19.2 msgpack/pickle files
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15848?src=pr&el=h1) Report
> Merging [#15848](https://codecov.io/gh/pandas-dev/pandas/pull/15848?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/b6d405d695249980aa2f93d58998412b4b81dcf3?src=pr&el=desc) will **decrease** coverage by `0.02%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/15848/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/15848?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #15848      +/-   ##
==========================================
- Coverage   90.97%   90.95%   -0.03%     
==========================================
  Files         143      143              
  Lines       49442    49442              
==========================================
- Hits        44982    44972      -10     
- Misses       4460     4470      +10
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.71% <ø> (-0.01%)` | :arrow_down: |
| #single | `40.69% <ø> (-0.11%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/15848?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/15848?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/common.py](https://codecov.io/gh/pandas-dev/pandas/pull/15848?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY29tbW9uLnB5) | `90.96% <0%> (-0.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/15848?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.56% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15848?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/15848?src=pr&el=footer). Last update [b6d405d...25e698c](https://codecov.io/gh/pandas-dev/pandas/pull/15848?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).