Bump github.com/stretchr/testify

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.7.0 to 1.7.1.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.7.0...v1.7.1)

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

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

exporter/prometheusremotewriteexporter/go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/resourcetotelemetry v0.37.1
 	github.com/prometheus/common v0.32.1
 	github.com/prometheus/prometheus v1.8.2-0.20210621150501-ff58416a0b02
-	github.com/stretchr/testify v1.7.0
+	github.com/stretchr/testify v1.7.1
 	github.com/tidwall/wal v0.1.5
 	go.opentelemetry.io/collector v0.37.1-0.20211026180946-46c8e2290e45
 	go.opentelemetry.io/collector/model v0.37.1-0.20211026180946-46c8e2290e45