chore(ci): add GitHub Actions to Dependabot

Signed-off-by: William Woodruff <william@astral.sh>

Author: woodruffw

.github/dependabot.yaml

@@ -5,3 +5,14 @@ updates:
     schedule:
       interval: "daily"
       time: "12:00"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      time: "12:00"
+    cooldown:
+      default-days: 7
+    groups:
+      github-actions:
+        patterns:
+          - "*"