Update actions/cache action to v6 (#26)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/tag-build.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v7
       - name: Cache Gradle packages
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
@@ -35,7 +35,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v7
       - name: Cache Gradle packages
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
@@ -54,7 +54,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v7
       - name: Cache Gradle packages
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}