Updated Firestore Emulator to v1.20.2

[harshyyy21]

Description

This PR updates the Firestore Emulator to v1.20.2

Scenarios Tested

: node lib/bin/firebase.js emulators:start --only firestore

⚠  Could not find config (firebase.json) so using defaults.
i  emulators: Starting emulators: firestore
⚠  firestore: Did not find a Cloud Firestore rules file specified in a firebase.json config file.
⚠  firestore: The emulator will default to allowing all reads and writes. Learn more about this option: https://firebase.google.com/docs/emulator-suite/install_and_configure#security_rules_configuration.
i  firestore: Firestore Emulator logging to firestore-debug.log
✔  firestore: Firestore Emulator UI websocket is running on 9150.

┌─────────────────────────────────────────────────────────────┐
│ ✔  All emulators ready! It is now safe to connect your app. │
│ i  View Emulator UI at http://127.0.0.1:4000/               │
└─────────────────────────────────────────────────────────────┘

┌───────────┬────────────────┬─────────────────────────────────┐
│ Emulator  │ Host:Port      │ View in Emulator UI             │
├───────────┼────────────────┼─────────────────────────────────┤
│ Firestore │ 127.0.0.1:8080 │ http://127.0.0.1:4000/firestore │
└───────────┴────────────────┴─────────────────────────────────┘
  Emulator Hub host: 127.0.0.1 port: 4400
  Other reserved ports: 4500, 9150

Issues? Report them at https://github.com/firebase/firebase-tools/issues and attach the *-debug.log files.

[gemini-code-assist]

Summary of Changes

Hello @harshyyy21, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on upgrading the Firestore Emulator to its latest version, v1.20.2. This update incorporates minor bug fixes, particularly for Datastore Mode, enhancing the emulator's reliability and functionality for developers. The change involves updating the emulator's version, expected file size, and checksum in the configuration, along with a corresponding changelog entry.

Highlights

• Firestore Emulator Version Update: The Firestore Emulator has been updated from version "1.19.8" to "1.20.2", ensuring users benefit from the latest improvements and stability.
• Changelog Entry: A new changelog entry has been added, indicating minor bug fixes in the Firestore Emulator specifically for Datastore Mode.

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[gemini-code-assist]

Code Review

This pull request updates the Firestore emulator to version 1.20.2. The changes are mostly correct, but there is a significant oversight in src/emulator/downloadableEmulatorInfo.json. The SHA256 checksum for the emulator JAR was not updated along with the other download details. This should be corrected to ensure data integrity and prevent potential issues in the future.

[joehan]

Looks like this is breaking the integration tests - does this require a higher version of java than previously?

[default stdout] i  firestore: Firestore Emulator logging to firestore-debug.log
[default stdout] ⚠  firestore: Unsupported java version, make sure java --version reports 1.8 or higher.
[default stdout] ⚠  firestore: Fatal error occurred: 
   Firestore Emulator has exited with code: 1, 
   stopping all running emulators