Bump github.com/stretchr/testify in /exporter/tanzuobservabilityexporter

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.8.4 to 1.11.1.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.8.4...v1.11.1)

---
updated-dependencies:
- dependency-name: github.com/stretchr/testify
  dependency-version: 1.11.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

exporter/tanzuobservabilityexporter/go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/cenkalti/backoff/v4 v4.2.1
 	github.com/google/uuid v1.3.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal v0.81.0
-	github.com/stretchr/testify v1.8.4
+	github.com/stretchr/testify v1.11.1
 	github.com/wavefronthq/wavefront-sdk-go v0.13.0
 	go.opentelemetry.io/collector v0.81.0
 	go.opentelemetry.io/collector/component v0.81.0