Bump types-python-dateutil from 2.9.0.20241206 to 2.9.0.20250516 (#3252)

Bumps
[types-python-dateutil](https://github.com/typeshed-internal/stub_uploader)
from 2.9.0.20241206 to 2.9.0.20250516.
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requirements/mypy.txt

@@ -4,6 +4,6 @@ markdown-toc==1.2.6
 mypy==1.15.0
 pre-commit==4.2.0
 types-certifi==2021.10.8.3
-types-python-dateutil==2.9.0.20241206
+types-python-dateutil==2.9.0.20250516
 types-PyYAML==6.0.12.20250516
 types-toml==0.10.8.20240310