Bump github.com/stretchr/testify in /receiver/dockerstatsreceiver

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.8.4 to 1.9.0.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.8.4...v1.9.0)

---
updated-dependencies:
- dependency-name: github.com/stretchr/testify
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

receiver/dockerstatsreceiver/go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal v0.85.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/docker v0.85.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatatest v0.85.0
-	github.com/stretchr/testify v1.8.4
+	github.com/stretchr/testify v1.9.0
 	github.com/testcontainers/testcontainers-go v0.23.0
 	go.opentelemetry.io/collector/component v0.85.1-0.20230921012510-68dd7d763b59
 	go.opentelemetry.io/collector/confmap v0.85.1-0.20230921012510-68dd7d763b59