Keep GitHub Actions up to date with GitHub's Dependabot (#2401)

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

* https://docs.github.com/en/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-dependabot
* https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#package-ecosystem

* Apply suggestions from code review

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

* Update .github/dependabot.yml

---------

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: Ee Durbin <ewdurbin@gmail.com>

Author: 3 people

.github/dependabot.yml

@@ -19,3 +19,11 @@ updates:
   - dependency-name: lxml
     versions:
     - 4.6.2
+- package-ecosystem: github-actions
+  directory: "/"
+  groups:
+    github-actions:
+      patterns:
+        - "*"  # Group all Actions updates into a single larger pull request
+  schedule:
+    interval: daily