Update webmozart/assert requirement from ^1.9 to ^2.1

[dependabot]

Updates the requirements on webmozart/assert to permit the latest version.

Release notes

Sourced from webmozart/assert's releases.

Release 2.1.3

See change log for changes.

Changelog

Sourced from webmozart/assert's changelog.

2.1.3

Fixed

• Corrected isList type documentation
• Corrected isAOf, isInstanceOf, etc type documentation

2.1.2

Fixed

• Changed all* assertion values back to mixed.

2.1.1

Fixed

• Optimized stringNotEmpty by internally using notSame.

2.1.0

Fixed

• Corrected @param declaration for isMap.
• Pass custom message to internal assertion calls.

2.0.0

Changed

• BREAKING Minimum PHP version is now 8.2 (was 7.2).
• BREAKING Remove deprecated isTraversable, use isIterable or isInstanceOf instead.
• BREAKING Added declare(strict_types=1) to all classes.
• Updated CI/CD test matrix to test PHP 8.2, 8.3, 8.4, and 8.5.
• Updated development tools (PHPUnit, Psalm, PHP-CS-Fixer) to supported versions.
• Added explicit return types and parameter types to all methods in both source code and tests.

Added

• All assertion methods now return the checked value.
• Added notInArray and notOneOf.
• Added isInitialized, to check if a class property is initialized.
• Added negativeInteger and notNegativeInteger
• Added isStatic and notStatic

Fixed

• Corrected validation of emails with unicode characters.

1.12.1

... (truncated)

Commits

• 6976757 Fix changelog
• 93b5140 Correct docblocks for isAOf and related (#346)
• 90ab582 Always use global sprintf (#345)
• 2654493 Verify the return of class_implements() (#344)
• fb831dd Use correct syntax for static calls (#343)
• b428c3f Correct isList type documentation (#342)
• a518094 Use of 'static' in callable is deprecated (#340)
• 5124865 Bump phpunit/phpunit from 11.5.46 to 11.5.50 in /tools/phpunit (#339)
• ce6a2f1 Prepare for 2.1.2 release
• b789271 Fixed iterable methods (all* + allNullOr*) types (return and $value parameter...
• Additional commits viewable in compare view

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