Bump genproto dependency

[liggitt]

This updates the genproto dependency to a version that carves out the rpc subpackage, reducing the surface area relied on by this library

See googleapis/go-genproto#1015 for more details

[liggitt]

I cannot reproduce the test failure locally:

$ go version
go version go1.20.6 linux/amd64

$ make coverage TESTFLAGS_RACE=-race
🇩 coverage
?   	github.com/containerd/ttrpc/internal	[no test files]
?   	github.com/containerd/ttrpc/plugin	[no test files]
ok  	github.com/containerd/ttrpc	1.290s
ok  	github.com/containerd/ttrpc	1.504s	coverage: 65.9% of statements
?   	github.com/containerd/ttrpc/cmd/protoc-gen-go-ttrpc	[no test files]
?   	github.com/containerd/ttrpc/cmd/protoc-gen-gogottrpc	[no test files]
ok  	github.com/containerd/ttrpc/integration	0.123s	coverage: [no statements]
?   	github.com/containerd/ttrpc/integration/streaming	[no test files]
?   	github.com/containerd/ttrpc/internal	[no test files]
?   	github.com/containerd/ttrpc/plugin	[no test files]

$ go test -race -v github.com/containerd/ttrpc -count=10
=== RUN   TestReadWriteMessage
--- PASS: TestReadWriteMessage (0.00s)
=== RUN   TestMessageOversize
--- PASS: TestMessageOversize (0.11s)
=== RUN   TestUserOnCloseWait
--- PASS: TestUserOnCloseWait (1.00s)
=== RUN   TestMetadataGet
--- PASS: TestMetadataGet (0.00s)
=== RUN   TestMetadataGetInvalidKey
--- PASS: TestMetadataGetInvalidKey (0.00s)
=== RUN   TestMetadataUnset
--- PASS: TestMetadataUnset (0.00s)
=== RUN   TestMetadataReplace
--- PASS: TestMetadataReplace (0.00s)
=== RUN   TestMetadataAppend
--- PASS: TestMetadataAppend (0.00s)
=== RUN   TestMetadataContext
--- PASS: TestMetadataContext (0.00s)
=== RUN   TestUnixSocketHandshake
--- PASS: TestUnixSocketHandshake (0.00s)
=== RUN   TestServerEOF
--- PASS: TestServerEOF (0.10s)
=== RUN   TestServer
--- PASS: TestServer (0.00s)
=== RUN   TestServerUnimplemented
--- PASS: TestServerUnimplemented (0.00s)
=== RUN   TestServerListenerClosed
--- PASS: TestServerListenerClosed (0.00s)
=== RUN   TestServerShutdown
--- PASS: TestServerShutdown (0.00s)
=== RUN   TestServerClose
--- PASS: TestServerClose (0.00s)
=== RUN   TestOversizeCall
--- PASS: TestOversizeCall (0.12s)
=== RUN   TestClientEOF
--- PASS: TestClientEOF (0.00s)
=== RUN   TestServerRequestTimeout
--- PASS: TestServerRequestTimeout (0.00s)
=== RUN   TestServerConnectionsLeak
--- PASS: TestServerConnectionsLeak (0.00s)
=== RUN   Test_MethodFullNameGeneration
--- PASS: Test_MethodFullNameGeneration (0.00s)
=== RUN   TestStreamClient
--- PASS: TestStreamClient (0.01s)
PASS
ok  	github.com/containerd/ttrpc	1.443s

$ go test -v -race github.com/containerd/ttrpc -count=1
=== RUN   TestReadWriteMessage
--- PASS: TestReadWriteMessage (0.00s)
=== RUN   TestMessageOversize
--- PASS: TestMessageOversize (0.11s)
=== RUN   TestUserOnCloseWait
--- PASS: TestUserOnCloseWait (1.00s)
=== RUN   TestMetadataGet
--- PASS: TestMetadataGet (0.00s)
=== RUN   TestMetadataGetInvalidKey
--- PASS: TestMetadataGetInvalidKey (0.00s)
=== RUN   TestMetadataUnset
--- PASS: TestMetadataUnset (0.00s)
=== RUN   TestMetadataReplace
--- PASS: TestMetadataReplace (0.00s)
=== RUN   TestMetadataAppend
--- PASS: TestMetadataAppend (0.00s)
=== RUN   TestMetadataContext
--- PASS: TestMetadataContext (0.00s)
=== RUN   TestUnixSocketHandshake
--- PASS: TestUnixSocketHandshake (0.00s)
=== RUN   TestServerEOF
--- PASS: TestServerEOF (0.10s)
=== RUN   TestServer
--- PASS: TestServer (0.00s)
=== RUN   TestServerUnimplemented
--- PASS: TestServerUnimplemented (0.00s)
=== RUN   TestServerListenerClosed
--- PASS: TestServerListenerClosed (0.00s)
=== RUN   TestServerShutdown
--- PASS: TestServerShutdown (0.20s)
=== RUN   TestServerClose
--- PASS: TestServerClose (0.00s)
=== RUN   TestOversizeCall
--- PASS: TestOversizeCall (0.07s)
=== RUN   TestClientEOF
--- PASS: TestClientEOF (0.00s)
=== RUN   TestServerRequestTimeout
--- PASS: TestServerRequestTimeout (0.00s)
=== RUN   TestServerConnectionsLeak
--- PASS: TestServerConnectionsLeak (0.00s)
=== RUN   Test_MethodFullNameGeneration
--- PASS: Test_MethodFullNameGeneration (0.00s)
=== RUN   TestStreamClient
--- PASS: TestStreamClient (0.01s)
PASS
...
ok  	github.com/containerd/ttrpc	13.410s

[fuweid]

LGTM