reject out-of-range utc offset components in TzinfoParser

[arib06]

Pull Request Checklist

• 🧪 Added tests for changed code.
• 🛠️ All tests pass when run locally (run tox or make test to find out!).
• 🧹 All linting checks pass when run locally (run tox -e lint or make lint to find out!).
• 📚 Updated documentation for changed code.
• ⏩ Code is up-to-date with the master branch.

Description of Changes

TzinfoParser.parse builds the offset from int(hours) * 3600 + int(minutes) * 60 without checking either field's range, so +0099 is silently accepted as +01:39 (99 minutes folded into 1h39m) while +2500/+9999 let a raw datetime ValueError escape instead of ParserError; rejecting hours > 23 or minutes > 59 in the parser keeps every valid offset working and turns the invalid ones into a normal parse error.