Fix ruamel.yaml pinning. Fixes docs and test process for EC2. #346
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Fixes #345
Also addresses outdated build and test process on EC2 by moving to AL2023 process.
Also addresses specific deprecations blocking testing by updating several processes like sphinx build and use of pyenv for tox processes. Other deprecation notices remain but will be addressed separately - this PR is focused on a clean build process for the current code and fixing this blocking issue.