chore: use version 1.19.9

[JrSchild]

To test

docker build --build-arg CLOUD_FIRESTORE_EMULATOR_VERSION=1.19.9 -t ridedott/firestore-emulator:1.19.9 .

# Stop & destroy currently running emulator
docker container rm -f ridedott-firestore-emulator

# Start the new version
docker container run --detach --name ridedott-firestore-emulator -p 4510:8080 --restart always ridedott/firestore-emulator:1.19.9

The new version has been taken from the google cloud storage firebase bucket.

This Pull Request fulfills the following requirements:

• The commit message follows our guidelines.
• Does not affect documentation or it has been added or updated.

Resolves #

[reyawn]

@JrSchild bumped to latest version 1.19.9 locally and did some testing, seems to work fine.