chore(makefile): align mockgen versions

[georgettica]

this caused a 'go-get' to be called and change the go.mod stuff

this change also changed some generated files

[georgettica]

the issue looks as follows:

go get github.com/golang/mock/mockgen@v1.4.4
go get: installing executables with 'go get' in module mode is deprecated.
	To adjust and download dependencies of the current module, use 'go get -d'.
	To install using requirements of the current module, use 'go install'.
	To install ignoring the current module, use 'go install' with a version,
	like 'go install example.com/cmd@latest'.
	For more information, see https://golang.org/doc/go-get-install-deprecation
	or run 'go help get' or 'go help install'.
go get: downgraded github.com/golang/mock v1.5.0 => v1.4.4
go get: removed github.com/openshift/gcp-project-operator v0.0.0-20210818135501-58ea50451037

[fahlmant]

/lgtm

[openshift-ci]

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