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 88.46%. Comparing base (6d2c5be) to head (e675e57).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #58   +/-   ##
=======================================
  Coverage   88.46%   88.46%           
=======================================
  Files           5        5           
  Lines          52       52           
=======================================
  Hits           46       46           
  Misses          6        6           

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