Consider upgrading to the Go version from 1.21 to 1.22

[mrajagopal]

There are numerous critical and high CVEs opened against Go v1.21.x. and fixed in Go 1.22.
https://security.snyk.io/package/linux/debian:13/golang-1.21

go.mod:
https://github.com/nginxinc/nginx-supportpkg-for-k8s/blob/72abbb4456669b3c77ab7fca840503f6d74ab8f0/go.mod#L3

Github actions:
https://github.com/nginxinc/nginx-supportpkg-for-k8s/blob/72abbb4456669b3c77ab7fca840503f6d74ab8f0/.github/workflows/go-builder.yml#L17