build(deps): bump github.com/slok/kubewebhook/v2 from 2.1.0 to 2.3.0

Bumps [github.com/slok/kubewebhook/v2](https://github.com/slok/kubewebhook) from 2.1.0 to 2.3.0.
- [Release notes](https://github.com/slok/kubewebhook/releases)
- [Changelog](https://github.com/slok/kubewebhook/blob/master/CHANGELOG.md)
- [Commits](slok/kubewebhook@v2.1.0...v2.3.0)

---
updated-dependencies:
- dependency-name: github.com/slok/kubewebhook/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -22,11 +22,9 @@ require (
 	github.com/klauspost/compress v1.13.6 // indirect
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/ostreedev/ostree-go v0.0.0-20210805093236-719684c64e4f // indirect
-	github.com/prometheus/client_golang v1.11.0
-	github.com/prometheus/common v0.31.0 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/prometheus/client_golang v1.12.1
 	github.com/rs/zerolog v1.25.0
-	github.com/slok/kubewebhook/v2 v2.1.0
+	github.com/slok/kubewebhook/v2 v2.3.0
 	github.com/spf13/cobra v1.4.0
 	github.com/spf13/viper v1.10.1
 	github.com/stretchr/objx v0.3.0 // indirect