Update go-grpc-middleware to v2

[SpencerC]

What was changed

Updated go-grpc-middleware to v2 and fixed broken APIs.

Why?

Outdated dependency.

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

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[Quinn-With-Two-Ns]

The linked issue refers to grpc_gateway not go-grpc-middleware so I am not sure how this PR is related

[SpencerC]

@Quinn-With-Two-Ns, my mistake, it isn't. 🥲

[tranngoclam]

@Quinn-With-Two-Ns can you review this PR please?