Bump generator to v1.12.1

[dhaiducek]

Pick up a bugfix found during feature verification

[mikeshng]

/approve

/lgtm

[openshift-ci]

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[dhaiducek]

Looks like there's a test flake here--I wouldn't think this PR would cause a failure. Could someone try re-running it, please?

• [FAILED] [78.229 seconds]
test create/update/delete appsub status for standalone and managed cluster
/home/runner/work/multicloud-operators-subscription/multicloud-operators-subscription/go/src/github.com/open-cluster-management/multicloud-operators-subscription/pkg/synchronizer/kubernetes/sync_appsubstatus_test.go:181
  [It] Test appsubReports and appsubstatus on standalone and managed cluster
  /home/runner/work/multicloud-operators-subscription/multicloud-operators-subscription/go/src/github.com/open-cluster-management/multicloud-operators-subscription/pkg/synchronizer/kubernetes/sync_appsubstatus_test.go:182

  Expected
      <bool>: false
  to be true
  In [It] at: /home/runner/work/multicloud-operators-subscription/multicloud-operators-subscription/go/src/github.com/open-cluster-management/multicloud-operators-subscription/pkg/synchronizer/kubernetes/sync_appsubstatus_test.go:457
------------------------------


Summarizing 1 Failure:
  [FAIL] test create/update/delete appsub status for standalone and managed cluster [It] Test appsubReports and appsubstatus on standalone and managed cluster
  /home/runner/work/multicloud-operators-subscription/multicloud-operators-subscription/go/src/github.com/open-cluster-management/multicloud-operators-subscription/pkg/synchronizer/kubernetes/sync_appsubstatus_test.go:457