core: bump github.com/stretchr/testify from 1.11.1 to 1.12.0 (#25146)

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.11.1 to 1.12.0.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](https://github.com/stretchr/testify/compare/v1.11.1...v1.12.0)

---
updated-dependencies:
- dependency-name: github.com/stretchr/testify
  dependency-version: 1.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -28,7 +28,7 @@ require (
 	github.com/sethvargo/go-envconfig v1.4.3
 	github.com/sirupsen/logrus v1.9.4
 	github.com/spf13/cobra v1.10.2
-	github.com/stretchr/testify v1.11.1
+	github.com/stretchr/testify v1.12.0
 	github.com/wwt/guac v1.3.2
 	golang.org/x/exp v0.0.0-20230210204819-062eb4c674ab
 	golang.org/x/oauth2 v0.36.0
@@ -43,7 +43,6 @@ require (
 	github.com/Azure/go-ntlmssp v0.1.1 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/felixge/httpsnoop v1.0.3 // indirect
 	github.com/go-asn1-ber/asn1-ber v1.5.8 // indirect
 	github.com/go-http-utils/fresh v0.0.0-20161124030543-7231e26a4b27 // indirect
@@ -80,7 +79,6 @@ require (
 	github.com/klauspost/compress v1.19.1 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/oklog/ulid/v2 v2.1.1 // indirect
-	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.70.1 // indirect
 	github.com/prometheus/procfs v0.21.1 // indirect