Bundle all action updates

Signed-off-by: Bryan Richter <b@chreekat.net>

Author: chreekat

.github/dependabot.yml

@@ -0,0 +1,12 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    # One big PR for all action updates
+    groups:
+      all-actions:
+        patterns:
+          - "*"