Failure to unmarshal E2_HIGHCPU_32 machineType

[dinvlad]

Hi Team,

Similarly to what's been reported previously in #105, our notifier fails to unmarshal E2_HIGHCPU_32 machineType:

notifiers.go:440] failed to unmarshal PubSub message id="" data="<REDACTED>" publishTime="2022-08-26T19:31:45.596Z" into a Build: proto: (line 33:20): invalid value for enum type: "E2_HIGHCPU_32"

It seems that the associated proto already has it - so perhaps the proto package just need to be updated? Although the go.mod version seems to be later than the one where this machine type was added.

Thanks