component/replication-manager: pin golang to 1.16

when using golang 1.17 build fail with errors like:

    github.com/jacobsa/fuse/internal/buffer.memclr: relocation target runtime.memclrNoHeapPointers not defined for ABI0 (but is defined for ABIInternal)
2 jobs for fix/repman-golang-1.16 in 0 seconds (queued for 35 seconds)
Status Job ID Name Coverage
  External
running SlapOS.Eggs.UnitTest-Master.Python2

26581:24:07

failed SlapOS.SoftwareReleases.IntegrationTest-Jerome-Python3

04:34:32