pinning sigs.k8s.io/json so go generate works on v1.17 go

[luthermonson]

Problem:

~\r\rke [pin-kdm] > go generate
# sigs.k8s.io/json/internal/golang/encoding/json
..\..\go\pkg\mod\sigs.k8s.io\json@v0.0.0-20211020170558-c049b76a60c6\internal\golang\encoding\json\encode.go:1249:12: sf.IsExported undefined (type reflect.StructField has no field or method IsExported)
..\..\go\pkg\mod\sigs.k8s.io\json@v0.0.0-20211020170558-c049b76a60c6\internal\golang\encoding\json\encode.go:1255:18: sf.IsExported undefined (type reflect.StructField has no field or method IsExported)
main.go:2: running "go": exit status 2

Fix: kubernetes-sigs/json#9

~\r\rke [release/v1.3] > go mod tidy
~\r\rke [release/v1.3] > go generate
Writing data
~\r\rke [release/v1.3] > go version
go version go1.17.8 windows/amd64

[rancherbot]

Approving pull request because all files are whitelisted for auto approval