Bump redhat-plumbers-in-action/differential-shellcheck from 5.5.5 to 5.5.6 (#495)

Author: yubiuser

.github/workflows/CI.yml

@@ -15,7 +15,7 @@ jobs:
         fetch-depth: 0 # Differential ShellCheck requires full git history
 
     - name: Differential ShellCheck
-      uses: redhat-plumbers-in-action/differential-shellcheck@0d9e5b29625f871e6a4215380486d6f1a7cb6cdd #v5.5.5
+      uses: redhat-plumbers-in-action/differential-shellcheck@d965e66ec0b3b2f821f75c8eff9b12442d9a7d1e #v5.5.6
       with:
         severity: warning
         display-engine: sarif-fmt