fix(deps): update module google.golang.org/protobuf to v1.36.8

[elastic-renovate-prod]

This PR contains the following updates:

Package	Type	Update	Change
google.golang.org/protobuf	require	patch	v1.36.6 -> v1.36.8

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Release Notes

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

v1.36.8

Compare Source

Maintenance:

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

v1.36.7

Compare Source

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)

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