CI: Run linter only on changes of JSON and MD files (#4527)

Author: EwoutH

.github/workflows/linter.yml

@@ -5,6 +5,10 @@ name: Linter
 on:
   pull_request:
     branches: [ main ]
+    paths:
+      - '**.json'
+      - '**.md'
+      - '**.sh'
 
 jobs:
   build:
@@ -18,12 +22,12 @@ jobs:
           fetch-depth: 0
 
       - name: Lint Code Base
-        uses: github/super-linter@v3
+        uses: github/super-linter/slim@v4
         env:
           VALIDATE_ALL_CODEBASE: false
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           VALIDATE_JSON: true
-          VALIDATE_MD: true
+          VALIDATE_MARKDOWN: true
           DEFAULT_BRANCH: ${{ github.base_ref }}
 
       - name: Checking shebang lines in MacOS and Ubuntu releases.