Keep GitHub Actions up to date with GitHub's Dependabot (#39)

* Keep GitHub Actions up to date with GitHub's Dependabot

Like Qiskit/qiskit#11602

* Update dependabot.yml

---------

Co-authored-by: Jake Lishman <jake.lishman@ibm.com>

.github/dependabot.yml

@@ -0,0 +1,19 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    groups:
+      GitHub_Actions:
+        patterns:
+          - "*"  # Group all Actions updates into a single larger pull request
+    schedule:
+      interval: weekly
+    labels:
+      - "type: qa"
+      - "dependencies"
+      - "Changelog: None"