chore(github-actions): update actions/checkout action to v7 (#66)

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

Author: renovate[bot]

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: Set up Java
         uses: actions/setup-java@v5
         with:

.github/workflows/publish_plugin_portal.yml

@@ -17,7 +17,7 @@ jobs:
       - check-release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: Set up Java for publishing to Gradle Plugin Portal
         uses: actions/setup-java@v5
         with: