Feature/make psr7 params nullable typed

[gin0115]

This pull request includes several changes to update the WordPress test suite workflows and improve code consistency and documentation. The most important changes include renaming and updating workflow files, modifying dependencies in composer.json, and enhancing code documentation.

Workflow Updates:

• Renamed and updated .github/workflows/wp59.yaml to .github/workflows/WP_6_2.yaml, changing the test suite name and PHP versions. [1] [2] [3]
• Renamed and updated .github/workflows/WP_6_1.yaml to .github/workflows/WP_6_3.yaml, changing the test suite name and PHP versions. [1] [2] [3]
• Added new workflow files for WordPress 6.4, 6.5, and 6.6 test suites with corresponding PHP versions. [1] [2] [3]
• Renamed and updated .github/workflows/WP_6_0.yaml to .github/workflows/WP_6_7.yaml, changing the test suite name and PHP versions. [1] [2] [3]

Dependency Updates:

• Updated composer.json to modify development dependencies and required PHP version.

Documentation Updates:

• Updated badges and test suite references in README.md. [1] [2]
• Enhanced code documentation in src/HTTP.php by adding return types and improving docblocks. [1] [2] [3] [4] [5] [6] [7]

Code Quality:

• Updated phpcs.xml to exclude additional rules for better code quality management