pipeline update

- phpunit workaround not required anymore as either moodle-plugin-ci bug was fixed or explicitly enabling pcov (instead of default phpdbg) for coverage avoids that bug (moodlehq/moodle-plugin-ci#204)
- update (unused) code checker to match new v4 of moodle-plugin-ci

.github/workflows/moodle-ci.yml

@@ -101,7 +101,7 @@ jobs:
       #     Coding style for this plugin differs from moodle's coding style in some points
       #      - name: Moodle Code Checker
       #        if: ${{ always() }}
-      #        run: moodle-plugin-ci codechecker --max-warnings 0
+      #        run: moodle-plugin-ci phpcs --max-warnings 0
 
       - name: Moodle PHPDoc Checker
         continue-on-error: true
@@ -133,11 +133,7 @@ jobs:
       - name: PHPUnit tests
         if: ${{ always() }}
         run: |
-          cd moodle
-          php -d pcov.enabled=1 -d pcov.directory=. vendor/bin/phpunit --coverage-text --configuration availability/condition/adler --testdox --coverage-clover availability/condition/adler/coverage.xml
-          # restore tests are randomly causing segfaults when run with moodle-plugin-ci, but run totally fine when run with phpunit directly
-          # https://github.com/moodlehq/moodle-plugin-ci/issues/204
-          # moodle-plugin-ci phpunit --fail-on-warning --coverage-clover --coverage-text -vvv
+          moodle-plugin-ci phpunit --fail-on-warning --coverage-clover --testdox --coverage-pcov --coverage-text -vvv
 
       - name: Coveralls upload
         continue-on-error: true