Updated projects and end of Python 3.9 support

Documentation

• Minor edits in projects page (PRs #165, #166)
• Update projects (PRs #162, #164, #167)

Misc

• Update Python version (PR #169)
• Update GH Action vers (PR #168)
• Replace hardcoded version with reference (PR #163)
• Update versions (PRs #161, #170)