Update dependency @types/mocha to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@types/mocha	8.2.2 -> 9.0.0

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Configuration

📅 Schedule: "before 3am on Friday" (UTC).

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 491c104

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[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (1b0e7af) and head commit (e97b39b).

Test Logs

• Base (1b0e7af1): https://github.com/firebase/firebase-js-sdk/actions/runs/1293186754
• Head (e97b39b4): https://github.com/firebase/firebase-js-sdk/actions/runs/1293444451

[google-oss-bot]

Size Analysis Report

Affected Products

Diffs between base commit (1b0e7af) and head commit (e97b39b) are too large (1,122,225 characters) to display.

Please check below links to see details from the original test log.

Test Logs

• Head (e97b39b): https://github.com/firebase/firebase-js-sdk/actions/runs/1293444451