Remove github.com/oauth2-proxy/tools/reference-gen from dependencies.
Instead we are now running it with "go run" with a version suffix.
Long version:
- github.com/oauth2-proxy/tools/reference-gen is removed from
tools/tool/go
- in pkg/apis/options/doc.go we now run reference-run with a version
suffix (go run package@version) with the version comming from go.mod.
- the "//go:generate" line is split in 2 lines (using the -command
flag) for readability
- "go mod tidy" for cleaning dependencies from go.mod, go.sum
Note: we are not upgrading reference-gen here. That will be a further
separate change.
