Add Dependabot configuration for pip and GitHub Actions

Co-authored-by: dannywillems <6018454+dannywillems@users.noreply.github.com>

Author: Copilot

.github/dependabot.yml

@@ -0,0 +1,24 @@
+# Dependabot configuration for l9format-python
+# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  # Monitor pip dependencies (Poetry uses pip under the hood)
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    labels:
+      - "dependencies"
+      - "python"
+
+  # Monitor GitHub Actions dependencies
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "github-actions"