Bump actions/checkout from 2 to 2.3.4 (#155)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 2.3.4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v2.3.4)

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

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

Author: dependabot[bot]

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           fetch-depth: 1
       - name: check

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           fetch-depth: 0
       - name: Generate changelog

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
         with:
           fetch-depth: 0
       - name: Run tests