Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

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

.github/workflows/buf.yaml

@@ -10,15 +10,15 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: bufbuild/buf-setup-action@v1
       - uses: bufbuild/buf-lint-action@v1
         with:
           buf_token: ${{ secrets.BUF_TOKEN }}
   breaking:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: bufbuild/buf-setup-action@v1
       - uses: bufbuild/buf-breaking-action@v1
         with:
@@ -30,7 +30,7 @@ jobs:
       - lint
       - breaking
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: bufbuild/buf-setup-action@v1
       - uses: bufbuild/buf-push-action@v1
         with:

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: setup-go
         uses: actions/setup-go@v4
         with:
@@ -37,7 +37,7 @@ jobs:
       - testlint
     steps:
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - id: auth
         name: auth-to-gcp
         uses: google-github-actions/auth@v1