update checkout action to v6

Author: wakingrufus

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
         java: [17, 21, 25]
     name: Gradle Build without Publish
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup git user
         run: |
           git config --global user.name "Nebula Plugin Maintainers"

.github/workflows/publish.yml

@@ -21,7 +21,7 @@ jobs:
       NETFLIX_OSS_REPO_USERNAME: ${{ secrets.ORG_NETFLIXOSS_USERNAME }}
       NETFLIX_OSS_REPO_PASSWORD: ${{ secrets.ORG_NETFLIXOSS_PASSWORD }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup git user
         run: |
           git config --global user.name "Nebula Plugin Maintainers"