fix(deps): Update dependency pandas to v2.1.2 (#77)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [pandas](https://pandas.pydata.org) ([source](https://github.com/pandas-dev/pandas)) | patch | `==2.1.1` -> `==2.1.2` |

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### Release Notes

<details>
<summary>pandas-dev/pandas (pandas)</summary>

### [`v2.1.2`](https://github.com/pandas-dev/pandas/releases/tag/v2.1.2): Pandas 2.1.2

[Compare Source](https://github.com/pandas-dev/pandas/compare/v2.1.1...v2.1.2)

This is a patch release in the 2.1.x series and includes some regression and bug fixes. We recommend that all users upgrade to this version.

See the [full whatsnew](https://pandas.pydata.org/pandas-docs/version/2.1.2/whatsnew/v2.1.2.html) for a list of all the changes.

The release will be available on the defaults and conda-forge channels:

    conda install pandas

Or via PyPI:

    python3 -m pip install --upgrade pandas

Please report any issues with the release on the [pandas issue tracker](https://github.com/pandas-dev/pandas/issues).

Thanks to all the contributors who made this release possible.

</details>

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setup.py

@@ -20,7 +20,7 @@
     "MarkupSafe==2.1.3",
     "numpy==1.26.1",
     "packaging==23.1",
-    "pandas==2.1.1",
+    "pandas==2.1.2",
     "pluggy==1.3.0",
     "protobuf==4.24.3",
     "pyarrow==13.0.0",