Improve CI coverage

[aik099]

CI tests only Firefox, so Chrome-specific problems go unnoticed.

Changes:

• add browser to the matrix and test Chrome on Selenium 2.53.1 and 3
• use 3 image tag (last Selenium 3 image) instead of 3.141.59
• run Selenium 4 only once, since it just checks that the driver refuses to work there
• collect coverage on PHP 7.3 too
• test on PHP 8.5 and use it instead of PHP 8.4 for browser/Selenium combinations, static analysis and composer.json check
• skip EventsTest::testKeyboardEvents on Chrome with Selenium 2
• print browser version used by Selenium image
• upload test results from all jobs (not only ones collecting coverage)
• replace deprecated codecov/test-results-action with codecov/codecov-action@v5 (report_type: test_results)

Coverage is collected only where the driver has code that runs differently:

• each Selenium version (PHP 8.5, Firefox): the driver checks Selenium version (W3C mode on Selenium 3, rejecting Selenium 4+)
• PHP 7.3: cookie encoding in setCookie/getCookie uses urlencode/urldecode before PHP 7.4

The driver has no browser checks, so Chrome jobs don't collect coverage.

PHP versions are still tested on Firefox + Selenium 2.53.1, the same way as in webdriver-classic-driver (see minkphp/webdriver-classic-driver#40).

Edge and Chromium (tested in webdriver-classic-driver CI) aren't added: their Docker images exist only for Selenium 4, which this driver doesn't support. Testing them wouldn't add much anyway: both are Chromium-based like Chrome, and the driver has no code specific to them.

The keyboard events test fails on Chrome 53 (in Selenium 2.53.1 image), because it ignores keyCode/charCode/which passed to new KeyboardEvent() (used by Syn to trigger the event): the event gets key code 0. Newer Chrome (e.g. 94 in Selenium 3 image) doesn't have this problem. webdriver-classic-driver skips this test on that combination too.

Supersedes #409.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.82%. Comparing base (d8b1d4e) to head (87458ff).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #416      +/-   ##
============================================
+ Coverage     85.42%   85.82%   +0.39%     
  Complexity      184      184              
============================================
  Files             1        1              
  Lines           501      501              
============================================
+ Hits            428      430       +2     
+ Misses           73       71       -2     

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