[github_actions] Add automatic updating of github-actions (#5919)

* Revert "Revert "Add automatic updating of github-actions (#5880)" (#5917)"

This reverts commit 8ded25d1b674e1461baf0ae236d208bdce78ac0f.

* Update dependabot.yml

Shortened prefix from "github_actions" to "gh_actions" in order to meet the 15 character max length requirement

.github/dependabot.yml

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 676ac1d..02bfe34 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -287,3 +287,11 @@
     schedule:
       interval: "daily"
     open-pull-requests-limit: 10
+    
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    commit-message:
+      prefix: "[gh_actions]"
+    schedule:
+      interval: "daily"
+    open-pull-requests-limit: 10