Add .phpunit.result.cache to .gitignore

Co-authored-by: henriquemoody <154023+henriquemoody@users.noreply.github.com>

Author: Copilot

.gitignore

@@ -1,3 +1,4 @@
 .phpcs.cache
 .phpunit.cache/
+.phpunit.result.cache
 /vendor/