Tests: Remove "Test PHP 7.3" and "Test PHP 7.2" against WP trunk #766

Describe the bug

The noted tests are failing for each pullrequest.
Reason for this error is that WordPress 7.0 will require at least PHP 7.4.
Given the fact that based on our readme.txt. we should support the latest two versions of WP i guess it would be ok to remove those tests against trunk and keep against the fixed WP Version

✖ Error while running docker compose command. Container fcd1849bfca3a3574b040ca68453c68e-tests-mysql-1 Running Container fcd1849bfca3a3574b040ca68453c68e-tests-wordpress-1 Running Your server is running PHP version 7.3.33 but WordPress 7.0-alpha-61568 requires at least 7.4::debug::Code: 1

Steps to Reproduce

1. go to a PR that has the tests already passed
2. see the failing tests

Screenshots, screen recording, code snippet

No response

Environment information

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Please confirm that you have searched existing issues in this repository.

Yes

Please confirm that you have tested with all plugins deactivated except Two-Factor.

Yes