Use package import for GRPC

[schmidt-sebastian]

Fixes #5983

[changeset-bot]

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Latest commit: 78d6e92

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[google-oss-bot]

Size Report ¹

Affected Products

• @firebase/firestore

  Type	Base (c1b9cf1)	Merge (3110587)	Diff
  main	463 kB	463 kB	+454 B (+0.1%)

Test Logs

• Base (c1b9cf1): https://github.com/firebase/firebase-js-sdk/actions/runs/1826095000
• Merge (3110587): https://github.com/firebase/firebase-js-sdk/actions/runs/1831438870

1. https://storage.googleapis.com/firebase-sdk-metric-reports/PU3zAmipbL.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (c1b9cf1) and merge commit (3110587).

Test Logs

• Base (c1b9cf1): https://github.com/firebase/firebase-js-sdk/actions/runs/1826095000
• Merge (3110587): https://github.com/firebase/firebase-js-sdk/actions/runs/1831438870

1. https://storage.googleapis.com/firebase-sdk-metric-reports/u8b7ABB2ml.html

[hsubox76]

I guess a 0.5KB increase isn't a big deal since it fixes a pretty important use case.

[schmidt-sebastian]

The increase is also only for Node.