Bump actions/checkout from 2 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 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...v3)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index e4725b7..4d41639 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -27,7 +27,7 @@
       - name: Set up Virtualenv
         run: pip install virtualenv
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 50
       - name: Run website_build.sh
diff --git a/.github/workflows/epochs.yml b/.github/workflows/epochs.yml
index 4ab98ff..a9590cb 100644
--- a/.github/workflows/epochs.yml
+++ b/.github/workflows/epochs.yml
@@ -9,7 +9,7 @@
     runs-on: ubuntu-20.04
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         fetch-depth: 0
     - name: Run epochs_update.sh
diff --git a/.github/workflows/interfaces.yml b/.github/workflows/interfaces.yml
index a9f829a..193106f 100644
--- a/.github/workflows/interfaces.yml
+++ b/.github/workflows/interfaces.yml
@@ -9,7 +9,7 @@
     runs-on: ubuntu-20.04
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Run interfaces_update.sh
       run: ./tools/ci/interfaces_update.sh
     - name: Create pull request
diff --git a/.github/workflows/manifest.yml b/.github/workflows/manifest.yml
index 7267150..b0fcbf0 100644
--- a/.github/workflows/manifest.yml
+++ b/.github/workflows/manifest.yml
@@ -15,7 +15,7 @@
       with:
         python-version: '3.9'
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         fetch-depth: 50
     - name: Install dependencies
diff --git a/.github/workflows/regen_certs.yml b/.github/workflows/regen_certs.yml
index 6bb6627..42e009d 100644
--- a/.github/workflows/regen_certs.yml
+++ b/.github/workflows/regen_certs.yml
@@ -14,7 +14,7 @@
       with:
         python-version: '3.9'
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Regenerate certs
       # Use a conditional step instead of a conditional job to work around #20700.
       if: github.repository == 'web-platform-tests/wpt'