build(deps): bump pygithub in /.github/actions/pr_notifier

Bumps [pygithub](https://github.com/pygithub/pygithub) from 1.59.0 to 2.1.1.
- [Release notes](https://github.com/pygithub/pygithub/releases)
- [Changelog](https://github.com/PyGithub/PyGithub/blob/main/doc/changes.rst)
- [Commits](PyGithub/PyGithub@v1.59.0...v2.1.1)

---
updated-dependencies:
- dependency-name: pygithub
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/actions/pr_notifier/requirements.txt

@@ -171,9 +171,9 @@ pycparser==2.20 \
     --hash=sha256:2d475327684562c3a96cc71adf7dc8c4f0565175cf86b6d7a404ff4c771f15f0 \
     --hash=sha256:7582ad22678f0fcd81102833f60ef8d0e57288b6b5fb00323d101be910e35705
     # via cffi
-pygithub==1.59.0 \
-    --hash=sha256:126bdbae72087d8d038b113aab6b059b4553cb59348e3024bb1a1cae406ace9e \
-    --hash=sha256:6e05ff49bac3caa7d1d6177a10c6e55a3e20c85b92424cc198571fd0cf786690
+pygithub==2.1.1 \
+    --hash=sha256:4b528d5d6f35e991ea5fd3f942f58748f24938805cb7fcf24486546637917337 \
+    --hash=sha256:ecf12c2809c44147bce63b047b3d2e9dac8a41b63e90fcb263c703f64936b97c
     # via -r requirements.in
 pyjwt[crypto]==2.4.0 \
     --hash=sha256:72d1d253f32dbd4f5c88eaf1fdc62f3a19f676ccbadb9dbc5d07e951b2b26daf \
@@ -199,22 +199,34 @@ pynacl==1.4.0 \
     --hash=sha256:ea6841bc3a76fa4942ce00f3bda7d436fda21e2d91602b9e21b7ca9ecab8f3ff \
     --hash=sha256:f8851ab9041756003119368c1e6cd0b9c631f46d686b3904b18c0139f4419f80
     # via pygithub
+python-dateutil==2.8.2 \
+    --hash=sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86 \
+    --hash=sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9
+    # via pygithub
 requests==2.31.0 \
     --hash=sha256:58cd2187c01e70e6e26505bca751777aa9f2ee0b7f4300988b709f44e013003f \
     --hash=sha256:942c5a758f98d790eaed1a29cb6eefc7ffb0d1cf7af05c3d2791656dbd6ad1e1
     # via pygithub
 six==1.16.0 \
     --hash=sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926 \
     --hash=sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254
-    # via pynacl
+    # via
+    #   pynacl
+    #   python-dateutil
 slack-sdk==3.21.3 \
     --hash=sha256:20829bdc1a423ec93dac903470975ebf3bc76fd3fd91a4dadc0eeffc940ecb0c \
     --hash=sha256:de3c07b92479940b61cd68c566f49fbc9974c8f38f661d26244078f3903bb9cc
     # via -r requirements.in
+typing-extensions==4.8.0 \
+    --hash=sha256:8f92fc8806f9a6b641eaa5318da32b44d401efaac0f6678c9bc448ba3605faa0 \
+    --hash=sha256:df8e4339e9cb77357558cbdbceca33c303714cf861d1eef15e1070055ae8b7ef
+    # via pygithub
 urllib3==1.26.6 \
     --hash=sha256:39fb8672126159acb139a7718dd10806104dec1e2f0f6c88aab05d17df10c8d4 \
     --hash=sha256:f57b4c16c62fa2760b7e3d97c35b255512fb6b59a259730f36ba32ce9f8e342f
-    # via requests
+    # via
+    #   pygithub
+    #   requests
 wrapt==1.12.1 \
     --hash=sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7
     # via deprecated