Bump github.com/stretchr/testify in /exporters/metric/dogstatsd (#524)

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.6.1 to 1.7.0.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.6.1...v1.7.0)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Tyler Yahn <[email protected]>

Author: dependabot[bot]

exporters/metric/dogstatsd/go.mod

@@ -3,7 +3,7 @@ module go.opentelemetry.io/contrib/exporters/metric/dogstatsd
 go 1.14
 
 require (
-	github.com/stretchr/testify v1.6.1
+	github.com/stretchr/testify v1.7.0
 	go.opentelemetry.io/otel v0.16.0
 	go.opentelemetry.io/otel/sdk v0.16.0
 )

exporters/metric/dogstatsd/go.sum

@@ -10,6 +10,8 @@ github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 go.opentelemetry.io/otel v0.16.0 h1:uIWEbdeb4vpKPGITLsRVUS44L5oDbDUCZxn8lkxhmgw=
 go.opentelemetry.io/otel v0.16.0/go.mod h1:e4GKElweB8W2gWUqbghw0B8t5MCTccc9212eNHnOHwA=
 go.opentelemetry.io/otel/sdk v0.16.0 h1:5o+fkNsOfH5Mix1bHUApNBqeDcAYczHDa7Ix+R73K2U=