Bump actions/setup-go from 5 to 6

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 5 to 6.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](actions/setup-go@v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
         os: [ubuntu-22.04, macos-13] # TODO: Add windows-2019
 
     steps:
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version: ${{ env.GO_VERSION }}
           cache: false # see actions/setup-go#368
@@ -54,7 +54,7 @@ jobs:
     timeout-minutes: 5
 
     steps:
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version: ${{ env.GO_VERSION }}
           cache: false # see actions/setup-go#368
@@ -79,7 +79,7 @@ jobs:
         with:
           path: src/github.com/containerd/plugin
 
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version: ${{ env.GO_VERSION }}