Bump github.com/stretchr/testify in /src/go/collectors/go.d.plugin

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] <[email protected]>

src/go/collectors/go.d.plugin/go.mod

@@ -38,7 +38,7 @@ require (
 	github.com/muesli/cancelreader v0.2.2
 	github.com/prometheus-community/pro-bing v0.3.0
 	github.com/prometheus/prometheus v2.5.0+incompatible
-	github.com/stretchr/testify v1.8.4
+	github.com/stretchr/testify v1.9.0
 	github.com/tomasen/fcgi_client v0.0.0-20180423082037-2bb3d819fd19
 	github.com/valyala/fastjson v1.6.4
 	github.com/vmware/govmomi v0.35.0

src/go/collectors/go.d.plugin/go.sum

@@ -315,8 +315,8 @@ github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
-github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/tomasen/fcgi_client v0.0.0-20180423082037-2bb3d819fd19 h1:ZCmSnT6CLGhfoQ2lPEhL4nsJstKDCw1F1RfN8/smTCU=
 github.com/tomasen/fcgi_client v0.0.0-20180423082037-2bb3d819fd19/go.mod h1:SXTY+QvI+KTTKXQdg0zZ7nx0u94QWh8ZAwBQYsW9cqk=
 github.com/valyala/fastjson v1.6.4 h1:uAUNq9Z6ymTgGhcm0UynUAB6tlbakBrz6CQFax3BXVQ=