fix(deps): update dependency @grpc/grpc-js to v1.12.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@grpc/grpc-js (source)	1.12.5 -> 1.12.6

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Release Notes

grpc/grpc-node (@​grpc/grpc-js)

v1.12.6

Compare Source

• Allow garbage collection of IDLE channels (#​2896)

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