Remove dierksen from CODEOWNERS.
Remove dierksen from CODEOWNERS.

PiperOrigin-RevId: 236347973

pinterest/tulsi,pinterest/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,pinterest/tulsi,pinterest/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,pinterest/tulsi,pinterest/tulsi,bazelbuild/tulsi