remove @latest from setupenvtest docs

Signed-off-by: Troy Connor <[email protected]>

Author: troy0820

tools/setup-envtest/README.md

@@ -8,7 +8,7 @@ To use it, just go-install it with Golang 1.24+ (it's a separate, self-contained
 module):
 
 ```shell
-go install sigs.k8s.io/controller-runtime/tools/setup-envtest@latest
+go install sigs.k8s.io/controller-runtime/tools/setup-envtest@release-0.22
 ```
 
 If you are using Golang 1.23, use the `release-0.20` branch instead: