Raise min PHP version to PHP 7.3, check compatibility PHP 8.3.

[terabytesoftw]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌

[what-the-diff]

PR Summary

• Updated Configuration for .yml Files
  The .editorconfig has been adjusted to require a 2-space indent size for .yml files, enhancing code readability.

• Link for Feedback / Design Discussion Updated
  The documentation now directs contributors to the updated link for providing feedback or initiating design conversations.

• Updated Package in Funding Info
  The Tidelift package for yii2-bootstrap has been updated to packagist/yiisoft/yii2-bootstrap5 in .github/FUNDING.yml.

• Improved Clarity in Issue Templates
  The phrase "What's expected?" has been clarified to "What is the expected result?" in issue reporting template to facilitate better user communication.

• Updated PHP Versions for Unit Tests
  The platform versions for running unit tests have been updated in .github/workflows/build.yml.

• More Stringent PHP and PHPUnit Version Requirements
  The composer.json now requires a higher PHP version (>=7.3), and a specific PHPUnit version (^9.6).

• Included src Directory in Code Coverage
  The src directory is now included in the code coverage configuration in phpunit.xml.dist.

• Tests Methods Return Types & Assertions Updated
  Various setUp methods across test files now use void return types for robustness. Moreover, assertions have been updated to assertStringContainsString and assertStringNotContainsString methods in ActiveFieldTest.php for improved test accuracy.

• Updated Exception Handling
  The testMissingLabel method in CollapseTest.php now expects an InvalidConfigException, enhancing error handling.

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