chore(ci): upgrade GitHub Actions to latest versions

Update actions/checkout, setup-java, setup-gradle, cache, and codecov actions to their latest major releases for improved stability and features.

Author: hanrw

.github/workflows/main.yml

@@ -16,10 +16,10 @@ jobs:
       SIGNING_KEY: ${{ secrets.SIGNING_KEY }}
       SIGNING_PASSWORD: ${{ secrets.SIGNING_PASSWORD }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.gradle/caches
@@ -28,14 +28,14 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
       - name: Set up JDK
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           java-version: 17
           distribution: 'zulu'
       - name: Build with Gradle
         run: ./gradlew clean build koverVerify koverXmlReport
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v4.0.1
+        uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           slug: tddworks/openai-kotlin

.github/workflows/releaase-to-central-sonatype.yml

@@ -40,13 +40,13 @@ jobs:
           fetch-depth: 0
 
       - name: Setup Java
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           distribution: 'temurin'
           java-version: 17
 
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v4
+        uses: gradle/actions/setup-gradle@v5
 
       - name: Validate version format
         run: |