Update paths for dependabot (microsoft#21920)

For microsoft#21139

Author: karthiknadig

.github/dependabot.yml

@@ -7,6 +7,27 @@ updates:
     labels:
       - 'no-changelog'
 
+  - package-ecosystem: 'github-actions'
+    directory: .github/actions/build-vsix
+    schedule:
+      interval: daily
+    labels:
+      - 'no-changelog'
+
+  - package-ecosystem: 'github-actions'
+    directory: .github/actions/lint
+    schedule:
+      interval: daily
+    labels:
+      - 'no-changelog'
+
+  - package-ecosystem: 'github-actions'
+    directory: .github/actions/smoke-test
+    schedule:
+      interval: daily
+    labels:
+      - 'no-changelog'
+
   # Not skipping the news for some Python dependencies in case it's actually useful to communicate to users.
   - package-ecosystem: 'pip'
     directory: /