Webapp: Use Python 3.12 and update dependencies

[matyasselmeci]

Python 3.9 is EOL and libraries are starting to drop support for it. Bring the software in the webapp up to date:

1. Build with EL9 instead of EL8
2. Use Python 3.12
3. Update all the requirements to the latest version

[matyasselmeci]

This is running on topology-itb.

[Copilot]

Pull request overview

Updates the webapp build/runtime stack to newer OS and Python versions to move off Python 3.9 EOL and align dependencies/CI accordingly.

Changes:

• Bump container base image to EL9 and install/use Python 3.12 in the Docker build.
• Refresh Python dependency pins (including mod_wsgi) for the webapp deployment.
• Update GitHub Actions validation workflows to run on Python 3.12.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
requirements-rootless.txt	Updates pinned Python dependencies; adds a couple of runtime deps (e.g., tzdata, typing-extensions).
requirements-apache.txt	Updates mod_wsgi version and adjusts build header comment for Python 3.12.
Dockerfile	Switches to EL9 base image; installs Python 3.12 toolchain and uses it for pip installs.
docker/apache.conf	Updates the mod_wsgi module load path to the Python 3.12 build.
.github/workflows/validate-data.yml	Runs data validation CI on Python 3.12.13.
.github/workflows/validate-code.yml	Runs code validation CI on Python 3.12.13.

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