Add grouped dependabot configuration (monthly, pip + actions)

Author: mrlesmithjr

.github/dependabot.yml

@@ -0,0 +1,23 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      github-actions:
+        patterns: ["*"]
+    labels: ["dependencies"]
+    commit-message:
+      prefix: "ci"
+
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      python-deps:
+        patterns: ["*"]
+    labels: ["dependencies"]
+    commit-message:
+      prefix: "chore"