Update actions/checkout action to v6 (#212)

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

Author: renovate[bot]

.github/workflows/build.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Validate Gradle Wrapper
         uses: gradle/actions/wrapper-validation@v5
       - name: Setup Java

.github/workflows/codeql.yml

@@ -19,7 +19,7 @@ jobs:
         language: ['java']
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v4
         with:

.github/workflows/upload-release-asset.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Validate Gradle Wrapper
         uses: gradle/actions/wrapper-validation@v5
       - name: Setup Java