validation message indicates wrong RFC, 3399 vs 3339

[tlynchpin]

should be 3339, not 3399:

terraform-provider-google/google/validation.go

Line 146 in 70e87c8

errors = append(errors, fmt.Errorf("%q (%q) must be in the format HH:mm (RFC3399)", k, time))

[github-actions]

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