Enable dependabot for current release branch (6.1).

Author: scoder

.github/dependabot.yml

@@ -2,6 +2,19 @@ version: 2
 updates:
   # Maintain dependencies for GitHub Actions
   - package-ecosystem: "github-actions"
+    target-branch: "master"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every week
+      interval: "weekly"
+    rebase-strategy: auto
+    groups:
+      github-actions:
+        patterns:
+          - "*"
+
+  - package-ecosystem: "github-actions"
+    target-branch: "lxml-6.1"
     directory: "/"
     schedule:
       # Check for updates to GitHub Actions every week