Bump actions/checkout from v2.3.3 to v2.3.4 (#34)

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>

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

.github/workflows/docs.yml

@@ -4,7 +4,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.3
+      - uses: actions/checkout@v2.3.4
       - uses: actions/setup-python@v2.1.4
         with:
           python-version: "3.8"

.github/workflows/labeler.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repository
-        uses: actions/checkout@v2.3.3
+        uses: actions/checkout@v2.3.4
 
       - name: Run Labeler
         if: success()

.github/workflows/pre-commit.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     name: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.3
+      - uses: actions/checkout@v2.3.4
       - uses: actions/setup-python@v2.1.4
         with:
           python-version: "3.9"