chore: Group Dependabot updates

Also, add GitHub Actions to Dependabot.

Author: hrkfdn

.github/dependabot.yml

@@ -1,7 +1,18 @@
 version: 2
 updates:
-- package-ecosystem: cargo
-  directory: "/"
-  schedule:
-    interval: daily
-    time: "04:00"
+  - package-ecosystem: cargo
+    directory: "/"
+    schedule:
+      interval: weekly
+    groups:
+      cargo:
+        patterns:
+          - "*"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: weekly
+    groups:
+      github-actions:
+        patterns:
+          - "*"