Version 1.5.0 - Python 3.11 support

Note: Vermin 1.6 will end support for py2.7

• Python 3.11 support (#124)
  • Added 124 rules specific to Python 3.11
  • Detect except* (PEP-654)
  • Updated list of built-in generic annotation types
• More stringent rules for detecting union types (#108 fixes #103)
• Don't visit returns annotations if not evaluating annotations (#110 fixes #109)
• typing_extensions backport and versioned backports support (#111 fixes #100)
• Added --exclude-regex and --no-make-paths-absolute to exclude specific file paths (#115, @cosmicexplorer)
• Plurality method of results messages with overridability
• General project tweaks
  • Don't test using end-of-life Python versions (3.4 and 3.5)
  • Added security policy and vulnerability report template
  • Added CODEOWNERS file
  • Added CONTRIBUTING file
  • Added OpenSSF best practices emblem to README
  • Check GitHub Actions and Pip deps every sunday via dependabot
  • Check CodeQL on PRs and Sundays. Not when pushing to master because PRs are required and otherwise it'll run two times: once for the PR and again when the accepted PR is merged to master.