Cleanup install on ubuntu runners (#730)

Fix
[failures](https://github.com/trunk-io/plugins/actions/runs/8566927464/job/23477663625)
introduced by php setup. Successful
[run](https://github.com/trunk-io/plugins/actions/runs/8575992769/job/23506162438?pr=730)

.github/actions/linter_tests/action.yaml

@@ -44,6 +44,11 @@ runs:
 
         case "$RUNNER_OS" in
           Linux)
+            # Cleanup any existing apt locks
+            sudo killall apt-get || true
+            sudo rm /var/lib/apt/lists/lock || true
+
+            # Install non-hermetic linters
             sudo apt-get update
             sudo apt-get -y install libperl-critic-perl perltidy zlib1g-dev
             DEBIAN_FRONTEND=noninteractive TZ=Etc/UTC sudo apt-get -y install tzdata