Update GitHub Actions automatically (#362)

Author: eed3si9n

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
   run-tests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Bazel output cache
         id: cache-bazel
         uses: actions/cache@v3

.github/workflows/release.yml

@@ -22,7 +22,7 @@ jobs:
             bazel_installer_sha: 35f398ad93af2b5eadd4b6b4fd4d4803b726029e572f40c4e1fe736db3de944b
             bazel_version: 4.2.1
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Bazel output cache
         id: cache-bazel
         uses: actions/cache@v1
@@ -69,7 +69,7 @@ jobs:
     needs: native-image
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Download linux bazel-deps
         uses: actions/download-artifact@v1
         with: