Upgrade go version, kubernetes api version

[nilesh-akhade]

• Upgrade go version to go1.19
• Upgrade k8s.io dependencies to v0.25.0

    go mod edit -go=1.19
    go get k8s.io/api@latest
    go get k8s.io/apimachinery@latest
    go get k8s.io/client-go@latest
    go get k8s.io/code-generator@latest
    go get k8s.io/component-base@latest
    go get k8s.io/kubernetes@latest
    go get k8s.io/sample-controller@latest
    go mod tidy
    go mod vendor
    # Fix token_test.go
    make test