chore(deps): update actions/checkout action to v4 (#26)

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

Author: renovate[bot]

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: "${{ matrix.os }}"
     steps:
       - name: "Checkout repository"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Set up Java ${{ env.JAVA_VERSION }}"
         uses: actions/setup-java@v3

.github/workflows/publish.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - name: "Checkout repository"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Set up Java ${{ env.JAVA_VERSION }}"
         uses: actions/setup-java@v3

.github/workflows/validate-gradle-wrapper.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
 
       - name: "Checkout repository"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: "Validate Gradle wrapper"
         uses: gradle/wrapper-validation-action@v1