Bump the actions-updates group across 1 directory with 2 updates

Bumps the actions-updates group with 2 updates in the / directory: [actions/checkout](https://github.com/actions/checkout) and [bufbuild/buf-action](https://github.com/bufbuild/buf-action).


Updates `actions/checkout` from 6.0.1 to 6.0.2
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@8e8c483...de0fac2)

Updates `bufbuild/buf-action` from 1.3.0 to 1.4.0
- [Release notes](https://github.com/bufbuild/buf-action/releases)
- [Changelog](https://github.com/bufbuild/buf-action/blob/main/RELEASE.md)
- [Commits](bufbuild/buf-action@8f4a145...fd21066)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions-updates
- dependency-name: bufbuild/buf-action
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions-updates
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/buf-ci.yaml

@@ -11,8 +11,8 @@ jobs:
   buf:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v4.2.0
-      - uses: bufbuild/buf-action@8f4a1456a0ab6a1eb80ba68e53832e6fcfacc16c # v1.3.0
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v4.2.0
+      - uses: bufbuild/buf-action@fd21066df7214747548607aaa45548ba2b9bc1ff # v1.4.0
         with:
           # Publishing schema changes to the BSR requires a BSR authentication token.
           token: ${{ secrets.BUF_TOKEN }}