misc: configure dependabot to use the right label (#8611)

.github/dependabot.yml

@@ -7,3 +7,12 @@ updates:
     open-pull-requests-limit: 99
     labels:
       - 'pr: dependencies'
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'daily'
+    # Disable version updates for npm dependencies
+    # https://docs.github.com/en/code-security/dependabot/dependabot-security-updates/configuring-dependabot-security-updates#overriding-the-default-behavior-with-a-configuration-file
+    open-pull-requests-limit: 0
+    labels:
+      - 'pr: dependencies'