Bump actions/checkout from 1 to 2.3.4

Bumps [actions/checkout](https://github.com/actions/checkout) from 1 to 2.3.4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v1...v2.3.4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/static-analysis.yml

@@ -16,7 +16,7 @@ jobs:
       name: Nextcloud ${{ matrix.ocp-version }}
       steps:
           - name: Checkout
-            uses: actions/checkout@master
+            uses: actions/checkout@v2.3.4
           - name: Set up php
             uses: shivammathur/setup-php@2.11.0
             with: