tools/protoc-gen-go: Update module google.golang.org/protobuf to v1.36.8

This MR contains the following updates:

Package	Type	Update	Change
google.golang.org/protobuf	require	patch	v1.36.5 -> v1.36.8

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Release Notes

protocolbuffers/protobuf-go (google.golang.org/protobuf)

v1.36.8

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Maintenance:

CL/696316: all: set Go language version to Go 1.23 CL/696315: types: regenerate using latest protobuf v32 release

v1.36.7

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Maintenance / optimizations:

CL/683955: encoding/protowire: micro-optimize SizeVarint (-20% on Intel) CL/674055: internal/impl: remove unnecessary atomic access for non-lazy lists CL/674015: impl: remove unnecessary nil check from presence.Present CL/673495: types/descriptorpb: regenerate using latest protobuf v31 release CL/670516: cmd/protoc-gen-go: centralize presence and lazy logic into filedesc CL/670515: internal: move usePresenceForField to internal/filedesc CL/670275: internal/impl: clean up usePresenceForField() (no-op)

v1.36.6

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Full Changelog: https://github.com/protocolbuffers/protobuf-go/compare/v1.36.5...v1.36.6

User-visible changes: CL/657895: internal_gengo: generate a const string literal for the raw descriptor CL/653536: proto: Add CloneOf[M Message](m M) M

Maintenance: CL/649135: all: set Go language version to Go 1.22 CL/654955: types/descriptorpb: regenerate using latest protobuf v30 release

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