Build: Update GitHub Actions

Should fix actions/cache spending four minutes just idling after each
workflow run.

GitHub: #80

.github/workflows/main.yml

@@ -12,9 +12,9 @@ jobs:
     env:
       ORG_GRADLE_PROJECT_branch: ${{ github.head_ref || github.ref_name }}
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
 
-      - uses: actions/setup-java@v3
+      - uses: actions/setup-java@v4
         with:
           distribution: temurin
           java-version: |
@@ -24,11 +24,11 @@ jobs:
             21
 
       # Can't use setup-java for this because https://github.com/actions/setup-java/issues/366
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: ~/.gradle/wrapper
           key: gradle-wrapper-${{ hashFiles('**/gradle-wrapper.properties') }}
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.gradle/caches