enh(ci): add consistent labels (#4845)

.github/dependabot.yml

@@ -6,4 +6,5 @@ updates:
       interval: weekly
     open-pull-requests-limit: 10
     labels:
-      - 'pr: dependencies'
+      - 'dependencies'
+      - 'gha'

.github/workflows/actionlint.yml

@@ -61,6 +61,13 @@ jobs:
               spaces: 2
               indent-sequences: true
               check-multi-line-strings: false
+            comments:
+              ignore-shebangs: true
+              min-spaces-from-content: 1
+            comments-indentation: disable
+            new-lines:
+              type: unix
+            new-line-at-end-of-file: enable
           EOF
 
       - name: Lint YAML files