Currently the Go SDK is notionally "unversioned" due to it's experimental state, however, a recent push in Dataflow has blocked all SDKs older than 2.21.0 from running against runner v2.
The Go SDK has been using runner v2 since May 28th (or around the 2.21 tagging, so first really included in 2.22) https://github.com/apache/beam/pull/11207
Jobs not using runner v2 should not be affected.
The work around for now is to update https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/runners/dataflow/dataflowlib/job.go#L128 to a version beyond "2.21.0" (say "2.26.0-dev")
I'm going to update that at head to stop the problem and update the release scripts to automatically increment that version, just like we do for python.