add pip group to dependabot config

for bumping git-cliff automatically

and group dependabot updates into 1 PR (for each ecosystem)

Author: 2bndy5

.github/dependabot.yml

@@ -9,3 +9,15 @@ updates:
     directory: /
     schedule:
       interval: "monthly"
+    groups:
+      actions:
+        patterns:
+          - "*"
+  - package-ecosystem: pip
+    directory: .github/
+    schedule:
+      interval: "monthly"
+    groups:
+      pip:
+        patterns:
+          - "*"