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 2.1.2

See change log for changes.

Changelog

Sourced from webmozart/assert's changelog.

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

Fixed

• Exclude tools from export.

1.12.0

... (truncated)

Commits

• ce6a2f1 Prepare for 2.1.2 release
• b789271 Fixed iterable methods (all* + allNullOr*) types (return and $value parameter...
• bdbabc1 Prepare changelog for 2.1.1
• 54230fa Update changelog for #336
• de8474e Use notSame instead of notEq for stringNotEmpty (#336)
• 1a44093 Prepare 2.1.0 release (oops)
• b01be90 Prepare 2.1.1 release
• 1cc0a45 Pass message from methods to integer assertion inside (#335)
• 6bfce1b Update changelog for last pr
• 70ed4bc Fix parameter type for Assert::isMap() (#331)
• Additional commits viewable in compare view

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