dependabot npm(deps): bump @grpc/grpc-js from 1.8.18 to 1.8.19

Bumps @grpc/grpc-js from 1.8.18 to 1.8.19.

Release notes

Sourced from @​grpc/grpc-js's releases.

@​grpc/grpc-js 1.8.19

• Update keepalive behavior to more correctly handle short calls and long periods of inactivity (#2513)

Commits

• 18dacfa Merge pull request #2513 from murgatroid99/grpc-js_keepalive_time_fix
• 42a0274 grpc-js: Fix compilation error from new @​types/node version
• 2e90603 grpc-js: Fix keepalive ping timing after inactivity
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