ci: modernize TagBot workflow

[sethaxen]

Update .github/workflows/TagBot.yml to the current recommended template: drop the deprecated lookback input and the permissions block, and add changelog_format: conventional since this repo uses Conventional Commits.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.16%. Comparing base (3db8b08) to head (0f53a07).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #124   +/-   ##
=======================================
  Coverage   92.16%   92.16%           
=======================================
  Files          24       24           
  Lines         536      536           
=======================================
  Hits          494      494           
  Misses         42       42           

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