dependabot npm(deps): bump @grpc/grpc-js from 1.9.1 to 1.9.4

Bumps @grpc/grpc-js from 1.9.1 to 1.9.4.

Release notes

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

@​grpc/grpc-js 1.9.4

• Fix a bug that could cause a client to sometimes incorrectly hold the process open when no longer in use (#2586)

@​grpc/grpc-js 1.9.3

• Make a few improvements to DNS resolving timing (#2571)

Experimental changes:

• Added grpc.experimental.BackoffTimeout#getEndTime

@​grpc/grpc-js 1.9.2

• Handle error when sending keepalive pings (#2563)
• Fix a bug that could cause invalid connection states when DNS updates contained the same address the client was already connected to (#2559 contributed by @​gusumuzhe, backported in #2564)

@​grpc/grpc-js-xds 1.9.2

• Fix proto file inconsistencies in published package (#2582)

Commits

• 7e53472 Merge pull request #2586 from murgatroid99/grpc-js_round_robin_backoff_ref
• ea6ba89 grpc-js: Bump version to 1.9.4
• aade055 Merge pull request #2587 from murgatroid99/grpc-js-xds_dont_update_submodule
• 4c68690 grpc-js-xds: Don't call git commands in npm scripts
• e6099d7 grpc-js: Unref backoff timer in subchannel
• 0ba73ea Merge pull request #2582 from murgatroid99/grpc-js-xds_1.9.2
• e1415fe grpc-js-xds: Force submodule update and code generation in prepare script
• 390a1a4 Merge pull request #2580 from murgatroid99/grpc-js-xds_fix_idle_handling
• c8b9a45 grpc-js-xds: Fix behavior when channel goes IDLE
• c8cbffa Merge pull request #2571 from murgatroid99/grpc-js_dns_backoff_fixes
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