fix: TRANSIFEX_API_TOKEN name corrected

[OmarIthawi]

Fix error in environment variable name that breaks the CI builds on GitHub Actions.

Fixes

Error in CI builds: https://github.com/openedx/openedx-translations/actions/runs/9410676907/job/25922716879

Notice:  A new release of pip is available: 23.0.1 -> 24.0
Notice:  To update, run: pip install --upgrade pip
Traceback (most recent call last):
  File "./scripts/release_project_sync.py", line 292, in <module>
    main()  # pragma: no cover
  File "./scripts/release_project_sync.py", line 288, in main
    command.run()
  File "./scripts/release_project_sync.py", line 227, in run
    main_project = self.get_transifex_project(project_slug=MAIN_PROJECT_SLUG)
  File "./scripts/release_project_sync.py", line 61, in get_transifex_project
    tx_api_token = config['https://www.transifex.com']['password']
  File "/opt/hostedtoolcache/Python/3.8.[18](https://github.com/openedx/openedx-translations/actions/runs/9410676907/job/25922716879#step:4:19)/x64/lib/python3.8/configparser.py", line 960, in __getitem__
    raise KeyError(key)
KeyError: 'https://www.transifex.com'
Error: Process completed with exit code 1.

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