Adjust `.tx/config` for new Transifex CLI
Adjust `.tx/config` for new Transifex CLI

The old Transifex Command-Line Tool is considered deprecated (as of
January 2022) and will sunset on Nov 30, 2022.

See: https://github.com/transifex/cli/blob/devel/README.md#migrating-from-older-versions-of-the-client

An accompanying PR: https://github.com/bitcoin-core/bitcoin-maintainer-tools/pull/142

Github-Pull: #26321
Rebased-From: d6adbb7ee1de661ad89879609eecd11129322405

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