Bump actions/checkout from v2.3.2 to v2.3.3

Bumps [actions/checkout](https://github.com/actions/checkout) from v2.3.2 to v2.3.3.
- [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/v2.3.2...a81bbbf8298c0fa03ea29cdc473d45769f953675)

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

.github/workflows/lint.yaml

@@ -12,7 +12,7 @@ jobs:
     name: Lint markdown
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.2
+    - uses: actions/checkout@v2.3.3
     - uses: avto-dev/markdown-lint@v1.4.0
       with:
         config: '.github/markdown-lint.yaml'
@@ -22,7 +22,7 @@ jobs:
     name: Lint Awesome list
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.2
+      - uses: actions/checkout@v2.3.3
         with:
           # Fetch all history to please linter's age checks.
           fetch-depth: 0