Update API Client for Guzzle 8 and QA PHP 3

[lennartvava]

Summary

Updates digipolisgent/api-client for Drupal 12-compatible dependency resolution and modernizes its QA tooling.

Changes

• Added Guzzle 8 support:

  • Updated guzzlehttp/guzzle from ^6.5 || ^7.0 to ^6.5 || ^7.0 || ^8.0.
  • Allows Drupal 12 consumers to resolve Guzzle PSR-7 3.x through Guzzle 8.
  • Retains compatibility with existing Guzzle 6 and 7 consumers.

• Updated QA tooling:

  • Updated district09/qa-php from ^2.2 to ^3.1.
  • Added PHP 8.5 to the GitHub Actions matrix.
  • Uses QA PHP’s shared, version-aware PHPUnit configuration.
  • Supports PHPUnit 11.5 and 12.5 through QA PHP.

• Simplified PHPUnit configuration:

  • Removed the package-local phpunit.xml.
  • Updated composer phpunit and composer coverage to run QA PHP’s GrumPHP test suite.
  • PHPUnit configuration is now generated automatically by QA PHP with the correct schema for the installed PHPUnit version.

• Updated documentation:

  • Refreshed package requirements and Guzzle compatibility information.
  • Updated testing instructions for QA PHP 3.1.
  • Documented automatic PHPUnit configuration and coverage output.
  • Replaced obsolete Travis CI badges with GitHub Actions badges.
  • Corrected the license link.
  • Added 4.2.0 changelog notes and release comparison link.

Verification

• Composer validation passed.
• Composer normalization passed.
• PHPUnit 12.5 passed: 26 tests, 44 assertions.
• Generated QA PHP PHPUnit configuration uses the PHPUnit 12.5 schema.
• Diff whitespace validation passed.

Release

This is intended for API Client 4.2.0.

[github-actions]

Coverage report for commit: a83b544
File: build/logs/clover.xml

Summary - Lines: 77.21% | Methods: 90.24%

Files	Lines	Methods	Branches
src/Client
AbstractClient.php	71.88%	83.33%	100.00%
src/Client/Token
OidcTokenProvider.php	-	-	100.00%

_{🤖 comment via lucassabreu/comment-coverage-clover}

[github-actions]

Coverage report for commit: 3317bb6
File: build/logs/clover.xml

Summary - Lines: 77.21% | Methods: 90.24%

Files	Lines	Methods	Branches
src/Client
AbstractClient.php	71.88%	83.33%	100.00%
src/Client/Token
OidcTokenProvider.php	-	-	100.00%

_{🤖 comment via lucassabreu/comment-coverage-clover}