Add dependabot to monitor GHA (#1567)

* Add dependabot to monitor GHA

Signed-off-by: Pedro Kaj Kjellerup Nacht <pnacht@google.com>

* Bump actions/checkout to v4

Signed-off-by: Pedro Kaj Kjellerup Nacht <pnacht@google.com>

---------

Signed-off-by: Pedro Kaj Kjellerup Nacht <pnacht@google.com>

.github/dependabot.yml

@@ -0,0 +1,15 @@
+# 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://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      github-actions:
+        patterns:
+          - "*"

.github/workflows/ci.yaml

@@ -23,7 +23,7 @@ jobs:
     name: Test JDK ${{ matrix.java }}, ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up JDK
         uses: actions/setup-java@v3
         with: