build(deps): bump actions/checkout from 2.4.0 to 3 (#1973)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.4.0 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@ec3a7ce...a12a394)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     name: All required files are present
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+      - uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
 
       - name: All required files are present
         run: bin/check_required_files_present
@@ -17,13 +17,13 @@ jobs:
     name: No test has been mutated
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+      - uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
         with:
           path: "new"
 
       # Pull Requests
       - name: Checkout the target branch
-        uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+        uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
         with:
           ref: "${{ github.base_ref }}"
           path: "old"
@@ -39,7 +39,7 @@ jobs:
     name: Schema validation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+      - uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
 
       - uses: actions/setup-node@9ced9a43a244f3ac94f13bfd896db8c8f30da67a
         with:
@@ -123,7 +123,7 @@ jobs:
     name: Lint markdown files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+      - uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
 
       - uses: DavidAnson/markdownlint-cli2-action@744f913a124058ee903768d3adb92a4847e5d132
         with:
@@ -134,7 +134,7 @@ jobs:
     name: Lint json files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+      - uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
 
       - name: Get yarn cache directory path
         id: yarn-cache-dir-path

.github/workflows/rebase.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+    - uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
       with:
         fetch-depth: 0
 

.github/workflows/sync-labels.yml

@@ -15,7 +15,7 @@ jobs:
     name: Sync labels
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+      - uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
       - uses: micnncim/action-label-syncer@3abd5ab72fda571e69fffd97bd4e0033dd5f495c
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}