Update dependency pyarrow to v16 (#176)

This PR contains the following updates:

| Package | Type | Update | Change | Pending |
|---|---|---|---|---|
| [pyarrow](https://arrow.apache.org/)
([source](https://github.com/apache/arrow)) | project.dependencies |
major | `==15.0.1` -> `==16.0.0` | `16.1.0` |

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pyproject.toml

@@ -15,7 +15,7 @@ dependencies = [
     "mex-model@git+https://github.com/robert-koch-institut/mex-model.git@2.3.0",
     "numpy==1.26.4",
     "pandas==2.2.1",
-    "pyarrow==15.0.1",
+    "pyarrow==16.0.0",
     "pydantic-settings==2.2.1",
     "pydantic==2.6.4",
     "requests==2.31.0",