Bump actions/checkout from v2.3.3 to v2.3.4 (#168)

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)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/maven.yml

@@ -37,7 +37,7 @@ jobs:
       fail-fast: false
 
     steps:
-    - uses: actions/checkout@v2.3.3
+    - uses: actions/checkout@v2.3.4
     - uses: actions/cache@v2
       with:
         path: ~/.m2/repository