chore: update dependencies

[shadowhand]

Summary by cubic

Updates development dependencies and replaces manual type assertions with php-standard-library/type helpers.

• Adds php-standard-library/type to the production require section.
• Replaces manual assert calls with PSL type assertions in the message and debugger classes.
• Segment recovery in AbstractGroup now ignores out-of-order groups instead of re-consuming them as segments.
• Renames Varies to Variable in MessageDebugger.
• The phpunit major bump to 13 may require adjusting custom test configuration.

^{Written for commit fe4d193. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}