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](https://github.com/actions/checkout/compare/v2.3.3...5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f)

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

.github/workflows/lint.yml

@@ -6,7 +6,7 @@ jobs:
   editorconfig-checker:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.3
+      - uses: actions/checkout@v2.3.4
       - name: editorconfig-checker
         run: |
           docker run --rm -v ${GITHUB_WORKSPACE}:/check mstruebing/editorconfig-checker
@@ -14,7 +14,7 @@ jobs:
   markdownlint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.3
+      - uses: actions/checkout@v2.3.4
       - name: markdownlint
         run: |
           find ~+ ${github_workspace} -name '*.md' | xargs docker run --rm -v ${GITHUB_WORKSPACE}:${GITHUB_WORKSPACE} markdownlint/markdownlint -r ~MD013,~MD033,~MD034,~MD046
@@ -22,7 +22,7 @@ jobs:
   yamllint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.3
+      - uses: actions/checkout@v2.3.4
       - name: yamllint
         run: |
           find ~+ ${github_workspace} -name '*.yaml' -o -name '*.yml' | xargs docker run --rm -v ${GITHUB_WORKSPACE}:${GITHUB_WORKSPACE} peterdavehello/yamllint yamllint -d '{extends: default, rules: {document-start: {present: false}, line-length: disable}}'

.github/workflows/mkdocs.yml

@@ -10,7 +10,7 @@ jobs:
     name: Deploy 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: