chore: bump actions/checkout from 2 to 3 (#1341)

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>

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

.github/workflows/canary.yml

@@ -12,7 +12,7 @@ jobs:
         os: [windows-latest, macOS-latest, ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           repository: electron/electron-quick-start
           ref: refs/heads/master

.github/workflows/docs.yml

@@ -11,7 +11,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Fetch all git branches
         run: git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*
       - uses: actions/setup-node@v2.4.1