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](actions/checkout@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>

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     continue-on-error: true
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup Node.js environment
         uses: actions/setup-node@v2.1.5
         with:

.github/workflows/coverage.yml

@@ -11,7 +11,7 @@ jobs:
   Unit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup Node.js environment
         uses: actions/setup-node@v2.1.5
         with:

.github/workflows/deploy-gh-pages.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           persist-credentials: false
           submodules: 'recursive'

.github/workflows/spec_update.yml

@@ -8,7 +8,7 @@ jobs:
   Update:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup Python environment
         uses: actions/setup-python@v2.2.2
         with: