Update uses dependencies for sphinx check

[kdaily]

Update actions/checkout to v4 and actions/setup-python to v5 when building the GitHub pages-based contributing guide.

Builds are failing with the following:

> Run make html
  make html
  shell: /usr/bin/bash -e {0}
  env:
    pythonLocation: /opt/hostedtoolcache/Python/3.10.15/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.10.15/x64/lib
sphinx-build -b html -d _build/doctrees   . _build/html
Running Sphinx v4.5.0

Sphinx version error:
The sphinxcontrib.applehelp extension used by this project needs at least Sphinx v5.0; it therefore cannot be built with this version.
make: *** [Makefile:49: html] Error 2
Error: Process completed with exit code 2.

Issue #, if available:

Description of changes:

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[kdaily]

That's not the right underlying issue, though we should update these. We pin the Sphinx version in the requirements file:

aws-cli/requirements.txt

Line 1 in 5b66447

Sphinx==4.5.0

Sphinx==4.5.0

[nateprewitt]

Do we not have dependabot managing these? We should move to hashes ideally and let that all be automated.

[kdaily]

Agree, looking at enabling that for this branch. Testing locally first to see that Sphinx build is going to work OK with new versions.

[kdaily]

Added dependabot management of GH actions and dependencies on the gh-pages branch here:

#9054