fix: update ./rs-drive-abci/.env.testnet

[coolaj86]

Updates ./packages/rs-drive-abci/.env.testnet as a possible solution for #1714

NOTE: I have no idea what the values should be updated to. Just taking some guesses.

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added or updated relevant unit/integration/functional/e2e tests
• [x] I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• [x] I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• [ ] I have assigned this pull request to a milestone