Update dependabot.yml

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

.github/dependabot.yml

@@ -20,3 +20,24 @@ updates:
   target-branch: development
   reviewers:
     - "pi-hole/core-maintainers"
+# As above, but for development-v6
+- package-ecosystem: github-actions
+  directory: "/"
+  schedule:
+    interval: weekly
+    day: saturday
+    time: "10:00"
+  open-pull-requests-limit: 10
+  target-branch: development-v6
+  reviewers:
+    - "pi-hole/core-maintainers"
+- package-ecosystem: pip
+  directory: "/test"
+  schedule:
+    interval: weekly
+    day: saturday
+    time: "10:00"
+  open-pull-requests-limit: 10
+  target-branch: development-v6
+  reviewers:
+    - "pi-hole/core-maintainers"