internal/gophers: update mikioh
internal/gophers: update mikioh

This change updates information related to mikioh to ensure hitless
switching; I'll delete the account mikioh.mikioh soon.

Change-Id: Id29705e59b12ca4633f700bd1303dbb7ac08b823
Reviewed-on: https://go-review.googlesource.com/c/144877
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/build,golang/build,golang/build,golang/build