build(deps): bump golangci/golangci-lint-action from 8 to 9

Bumps [golangci/golangci-lint-action](https://github.com/golangci/golangci-lint-action) from 8 to 9.
- [Release notes](https://github.com/golangci/golangci-lint-action/releases)
- [Commits](golangci/golangci-lint-action@v8...v9)

---
updated-dependencies:
- dependency-name: golangci/golangci-lint-action
  dependency-version: '9'
  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

@@ -42,6 +42,6 @@ jobs:
           go-version: ${{ matrix.go }}
           cache: true
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@v8
+        uses: golangci/golangci-lint-action@v9
         with:
           version: ${{ matrix.lint }}

client.go

@@ -326,5 +326,5 @@ func rawResponseFromErr(err error) []byte {
 	}
 
 	// if the error is not an HTTPError return instead the error's details
-	return []byte(fmt.Sprintf("%v", err))
+	return fmt.Appendf(nil, "%v", err)
 }

retry/exp_backoff_test.go

@@ -1,5 +1,4 @@
 //go:build integrationtest || !unittest
-// +build integrationtest !unittest
 
 package retry_test