fix(deps): update dependency @grpc/grpc-js to v0.6.13

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
@grpc/grpc-js (source)	dependencies	patch	0.6.12 -> 0.6.13

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[codecov]

Codecov Report

Merging #548 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #548   +/-   ##
=======================================
  Coverage   94.07%   94.07%           
=======================================
  Files          12       12           
  Lines         928      928           
  Branches      192      192           
=======================================
  Hits          873      873           
  Misses         44       44           
  Partials       11       11

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