Support PHP 8.3 and PHP 8.4, WordPress 6.7.1 and PHPUnit 10 & 11

[bobbingwide]

Update code and tests to support PHP 8.3
See https://github.com/bobbingwide/bobbingwide

Specifically, cater for PHP 8.3 EOL date, which is 23rd November 2023 - for end of security support.

Warning: Undefined array key "8.3" in C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\admin\class-oik-trace-info.php on line 233

[bobbingwide]

PHP 8.4 will be released in November and already has a published EOL date in 2028.

[bobbingwide]

I got the following message when defining Trace files for the first time in s.b/officialcaravan

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\admin\class-oik-trace-summary.php on line 96

[bobbingwide]

With PHP 8.4 installed I got the following message

[23-Nov-2024 15:42:30 UTC] PHP Deprecated: Constant E_STRICT is deprecated in C:\apache\htdocs\wordpress\wp-content\plugins\oik-bwtrace\includes\bwtrace-actions.php on line 256

[bobbingwide]

Now that PHP 8.4 has been released we need to test with that version
Which means changing the PHPUnit tests to be compatible with PHPUnit 10 and 11
And testing with WordPress 6.7.1

See bobbingwide/bobbingwide#141

Having followed the process documented here bobbingwide/bobbingwide#141 (comment)
the PHPUnit tests failed for PHPUnit 9.
This was due to the fact that the tests depended on the tests in test--oik-bwtrace.php to be run first.
After the file was renamed to match the class name Tests_oik_bwtrace
these tests were no longer run first.
The pragmatic solution was to rename the class to Tests__oik_bwtrace and rename the file as well.
The test sequence in the same order as before, allowing the tests to pass.