chore: Change tested Python version to 3.11 & 3.12

[bmtcril]

From 3.8 and 3.11.

edx-platform has moved to 3.11, we no longer need to support 3.8 and some requirements we have are starting to require 3.9+. See: https://github.com/openedx/platform-plugin-aspects/pull/71

Merge checklist: Check off if complete or not applicable:

• [ ] Version bumped
• [ ] Changelog record added
• [ ] Documentation updated (not only docstrings)
• [ ] Fixup commits are squashed away
• [ ] Unit tests added/updated
• [ ] Manual testing instructions provided
• [ ] Noted any: Concerns, dependencies, migration issues, deadlines, tickets

[github-actions[bot]]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
platform_plugin_aspects
tasks.py
xblock.py
platform_plugin_aspects/management/commands
load_test_tracking_events.py
monitor_load_test_tracking.py
platform_plugin_aspects/sinks
base_sink.py
course_overview_sink.py
Project Total

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