build(deps): bump the github-actions group with 2 updates

Bumps the github-actions group with 2 updates: [actions/checkout](https://github.com/actions/checkout) and [actions/cache](https://github.com/actions/cache).


Updates `actions/checkout` from 6 to 7
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

Updates `actions/cache` from 5 to 6
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: actions/cache
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       # A released Go is needed only to `go install` and bootstrap gotip.
       - name: Install bootstrap Go
@@ -35,7 +35,7 @@ jobs:
       # newer gotip commit.
       - name: Cache gotip toolchain
         id: cache-gotip
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: |
             ~/sdk/gotip
@@ -53,7 +53,7 @@ jobs:
 
       # Module + build cache for faster test runs.
       - name: Cache Go modules and build
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: |
             ~/.cache/go-build