github-cicd: shellcheck: use the latest version for now

If we keep tripping up on SC2145 (I can see in my repo that there are
thousands of affected scripts pulled in from other repos that I
shouldn't attempt to fix), then we might consider disabling or
limiting that entire check per

        ignore_paths: >-
          ignoreme
          ignoremetoo
          **/ignoreme/test.sh
        ignore_names: ignorable.sh

or

      env:
        SHELLCHECK_OPTS: -e SC2145
        # ... SC2059 -e SC2034 -e SC1090

or

     with:
       scandir: './scripts'

Might also want:

      with:
        severity: error

See https://github.com/marketplace/actions/shellcheck for usage

Author: spacelama

.github/workflows/shellcheck.yml

@@ -9,7 +9,7 @@ on:
       git-ref:
         description: Git Ref (Optional)
         required: false
-  
+
 permissions:
   contents: read
 
@@ -18,8 +18,9 @@ jobs:
     name: ShellCheck
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Run ShellCheck
-        uses: ludeeus/action-shellcheck@2.0.0
+        uses: ludeeus/action-shellcheck@master
         with:
           format: gcc
+#          format: diff