Fix lint issues in tests.

[fraggerfox]

This pull request includes several updates to type annotations, PHP version, and test improvements. The changes primarily focus on enhancing type safety, updating dependencies, and improving the clarity and robustness of tests.

Type Annotation Updates:

• Updated various type annotations in src/Exception/CallbackException.php to allow mixed types in errorDetails and related methods. [1] [2]
• Changed type hints in src/HelloRequest/HelloRequest.php and src/HelloRequest/HelloRequestInterface.php to allow mixed types for fetched parameters and headers. [1] [2]

Dependency Updates:

• Updated the PHP version to 8.3 in the .github/workflows/php-tests.yml file.
• Modified the psalm command in composer.json to disable caching.

Test Improvements:

• Added type annotations to various test methods to ensure they return void in multiple test files. [1] [2] [3]
• Enhanced assertions in tests/Handler/AuthTest.php to include type checks for fetched values.

These changes collectively improve the codebase's type safety, ensure compatibility with the latest PHP version, and enhance test reliability.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Handler/Login.php	50.00%	2 Missing ⚠️
src/Type/AuthUpdates.php	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
src/Exception/CallbackException.php	100.00% <ø> (ø)	2.00 <0.00> (ø)
src/Handler/Callback.php	68.55% <ø> (ø)	35.00 <0.00> (ø)
src/Handler/Logout.php	100.00% <ø> (ø)	4.00 <0.00> (ø)
src/HelloClient.php	51.85% <100.00%> (+1.85%)	25.00 <0.00> (ø)
src/HelloRequest/HelloRequest.php	82.75% <100.00%> (ø)	13.00 <4.00> (ø)
src/Utils/QueryParamFetcher.php	100.00% <ø> (ø)	2.00 <0.00> (ø)
src/Handler/Login.php	95.23% <50.00%> (-1.49%)	11.00 <0.00> (ø)
src/Type/AuthUpdates.php	0.00% <0.00%> (ø)	11.00 <2.00> (ø)