OTP29 compat

[mworrell]

This pull request improves error handling throughout the codebase by replacing the use of catch with more robust try ... catch constructs, ensuring more precise error matching and better stacktrace reporting. Additionally, it updates CI dependencies and enhances test coverage for error scenarios.

Error handling improvements:

• Replaced catch with try ... catch in z_convert.erl for to_utc/1 and to_localtime/1, allowing for more granular error and exit handling when converting between local and UTC times. [1] [2]
• Updated nows_protocol_split/2 in z_html.erl to use try ... catch for binary-to-integer conversion, specifically catching badarg errors for invalid percent-encoded sequences.
• Refactored error handling in z_ubf.erl for decode/2 and encode/3 to use try ... catch, capturing both error reasons and stacktraces for improved debugging. [1] [2]

Testing improvements:

• Added new tests in z_convert_test.erl for invalid timezone conversions and in z_ubf_test.erl for decode/encode error cases, including assertions for error types and stacktraces. [1] [2]
• Included a test for handling invalid percent-encoded input in z_html:noscript/1.

CI and dependency updates:

• Updated the GitHub Actions workflow in .github/workflows/test.yml to test against newer OTP versions (27, 28, 29) and upgraded the actions/checkout version to v7 for improved CI reliability.