Bump actions/checkout from v2.3.3 to v2.3.4

Bumps [actions/checkout](https://github.com/actions/checkout) from v2.3.3 to v2.3.4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.3...5a4ac90)

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
     name: on ${{ matrix.platform }}
 
     steps:
-    - uses: actions/checkout@v2.3.3
+    - uses: actions/checkout@v2.3.4
     - name: Set up JDK 8
       uses: actions/setup-java@v1
       with:

.github/workflows/sync-labels.yml

@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.3
+      - uses: actions/checkout@v2.3.4
       - uses: micnncim/action-label-syncer@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}