Servicex

This is a minor-bug fix release.

What's Changed
* Safeguard against VMS version numbers in tree names returned by `uproot` by gordonwatts in https://github.com/ssl-hep/ServiceX_frontend/pull/327


**Full Changelog**: https://github.com/ssl-hep/ServiceX_frontend/compare/v2.7...v2.7.1

This is a minor update:

What's Changed
* Multiple Code Generators by talvandaalen in https://github.com/ssl-hep/ServiceX_frontend/pull/263
* Fix typos: depreciated -> deprecated by eguiraud in https://github.com/ssl-hep/ServiceX_frontend/pull/268
* Awkward 2.0 support in `servicex` 2.0 by gordonwatts in https://github.com/ssl-hep/ServiceX_frontend/pull/317
* Deal with empty and bad dataset names by gordonwatts in https://github.com/ssl-hep/ServiceX_frontend/pull/314

New Contributors
* eguiraud made their first contribution in https://github.com/ssl-hep/ServiceX_frontend/pull/268

**Full Changelog**: https://github.com/ssl-hep/ServiceX_frontend/compare/2.6.2...v2.7

This is a minor update:

What's Changed
* Multiple Code Generators by talvandaalen in https://github.com/ssl-hep/ServiceX_frontend/pull/263
* Fix typos: depreciated -> deprecated by eguiraud in https://github.com/ssl-hep/ServiceX_frontend/pull/268
* Awkward 2.0 support in `servicex` 2.0 by gordonwatts in https://github.com/ssl-hep/ServiceX_frontend/pull/317
* Deal with empty and bad dataset names by gordonwatts in https://github.com/ssl-hep/ServiceX_frontend/pull/314

New Contributors
* eguiraud made their first contribution in https://github.com/ssl-hep/ServiceX_frontend/pull/268

**Full Changelog**: https://github.com/ssl-hep/ServiceX_frontend/compare/2.6.2...v2.7

Fix the Coffea Casa Frontend to stop printing the bearer token!

Development release that pulls in a JWT from WLCG bearer token file if present

Production release supporting the use of multiple code generators in the backend to power the requested transform.

Specific enhancements / fixes include:
- `codegen` argument for multiple code generator support on the backend
- `backend_type` argument to have the `codegen` argument default to the correct value if not specified
- correct `codegen` naming conventions propagated from the yaml file
- fixes for root-file/parquet handling
- update to the README