Exception - Class "PHP_CodeSniffer\Util\MessageCollector" not found

[RussellEngland]

Just pulled v5.0.9 and get this error :(

Same for Moodle 4.5.5+, 5.0.1+ and 5.1dev

Exception - Class "PHP_CodeSniffer\Util\MessageCollector" not found

[More information about this error](https://docs.moodle.org/500/en/error/moodle/generalexceptionmessage)

Debug info:
Error code: generalexceptionmessageDismiss this notification
Stack trace:
line 164 of /local/codechecker/vendor/squizlabs/php_codesniffer/src/Ruleset.php: Error thrown
line 348 of /local/codechecker/vendor/squizlabs/php_codesniffer/src/Runner.php: call to PHP_CodeSniffer\Ruleset->__construct()
line 119 of /local/codechecker/classes/runner.php: call to PHP_CodeSniffer\Runner->init()
line 131 of /local/codechecker/classes/runner.php: call to local_codechecker\runner->init()
line 106 of /local/codechecker/index.php: call to local_codechecker\runner->run()

Steps to reproduce

1. Update codechecker to v5.0.9
2. Upgrade Moodle
3. Go to Site admin > Development > Code checker
4. Enter local/codechecker

Workaround - revert to 5.0.8

1. cd local/codechecker
2. git checkout v5.0.8
3. uninstall codechecker php admin/cli/uninstall_plugins.php --plugins=local_codechecker --run
4. Upgrade moodle php admin/cli/upgrade.php