Allow Vertex AI config via env vars

As well as upgrading a number of dependencies this change also makes it possible to define the project and location of your GCP project in environment variables:

export VERTEX_AI_PROJECT="..."
export VERTEX_AI_LOCATION="..."

Full Changelog: genesys-web-messaging-tester-cli-v3.0.2...genesys-web-messaging-tester-cli-v3.0.3