ci: add auto-merge label to Dependabot PRs (nodejs#8754)

* Add auto-merge label to Dependabot PRs

* Add standard labels to Dependabot PRs

Author: MattIPv4

.github/dependabot.yml

@@ -5,7 +5,10 @@ updates:
     schedule:
       interval: monthly
     labels:
+      - 'dependencies'
+      - 'github_actions'
       - 'github_actions:pull-request'
+      - 'auto-merge'
     commit-message:
       prefix: meta
     cooldown:
@@ -18,7 +21,10 @@ updates:
     schedule:
       interval: monthly
     labels:
+      - 'dependencies'
+      - 'javascript'
       - 'github_actions:pull-request'
+      - 'auto-merge'
     commit-message:
       prefix: meta
     cooldown: