build(deps): Bump actions/checkout from 2 to 2.3.4 (#6456)

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](https://github.com/actions/checkout/compare/v2...v2.3.4)

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

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

.github/workflows/coverage.yml

@@ -10,7 +10,7 @@ jobs:
   split-test-files:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Create a file with all the pkgs
         run: go list ./... > pkgs.txt
       - name: Split pkgs into 4 files
@@ -45,7 +45,7 @@ jobs:
       - uses: actions/setup-go@v2
         with:
           go-version: "1.16"
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - uses: technote-space/get-diff-action@v4
         with:
           PATTERNS: |
@@ -67,7 +67,7 @@ jobs:
       - uses: actions/setup-go@v2
         with:
           go-version: "1.16"
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - uses: technote-space/get-diff-action@v4
         with:
           PATTERNS: |
@@ -95,7 +95,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: tests
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - uses: technote-space/get-diff-action@v4
         with:
           PATTERNS: |