Log Message:
Update to 9.21. From the changelog:

- Added EXPERIMENTAL support for top-level await to Mojo::Promise.
- Updated Future::AsyncAwait requirement to 0.52 for new features and
  bug fixes.
- Improved *_attr and *_text methods in Test::Mojo to return undef
  instead of empty string for values that do not exist. (tim-2)
- Fixed Mojo::DOM not to auto-close tags in <svg> and <math>
  blocks. (mkende)
- Added trace log level to Mojo::Log.
- Changed default log level in Mojo::Log from "debug" to \ 
"trace" and
  moved all built-in "debug" log messages to the level \ 
"trace". That
  will allow for the "debug" level to be used exclusively for user
  defined log messages.
- Switched from HMAC-SHA1 to HMAC-SHA256 for signed cookies. Note that
  this means that all sessions will be reset.
- Improved signed cookie based sessions to pad short values, to make it
  harder to brute force attack the application secret. (jberger)
- Remove Font Awesome from distribution.
- This release contains fixes for security issues, everybody
  should upgrade!