Bump actions/checkout from v2.3.1 to v2.3.3

Bumps [actions/checkout](https://github.com/actions/checkout) from v2.3.1 to v2.3.3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.1...a81bbbf)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/[email protected].1
+      - uses: actions/[email protected].3
       - uses: actions/cache@v2
         with:
           path: ~/.m2/repository