Update README.md with Node.js and JDK versions

[DellaBitta]

Discussion

An update to the readme to document the Node.js and JDK versions required to build the SDK from source.

Issue #7042

Testing

N/A

API Changes

N/A

[changeset-bot]

⚠️ No Changeset found

Latest commit: a1f8261

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (e522056) and merge commit (f9e8ddf).

Test Logs

• Base (e522056): https://github.com/firebase/firebase-js-sdk/actions/runs/5247778830
• Merge (f9e8ddf): https://github.com/firebase/firebase-js-sdk/actions/runs/5259968056

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

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (e522056) and merge commit (f9e8ddf).

Test Logs

• Base (e522056): https://github.com/firebase/firebase-js-sdk/actions/runs/5247778830
• Merge (f9e8ddf): https://github.com/firebase/firebase-js-sdk/actions/runs/5259968056

1. https://storage.googleapis.com/firebase-sdk-metric-reports/GmqP80pezk.html