Edx-rest-api-client

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- Updated Python requirement files with `Python 3.11`.
- Dropped support for `Python 3.8` from `tox.ini`.
- Bumped the package version to `6.1.0`.

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* Breaking Change: The EdxRestApiClient` has been deprecated and removed in this release.

* Breaking Change: Dropping Python 3.8 support

* We no longer test with ubuntu 20.04 and test with whatever is the latest
ubuntu supplied by the ``ubuntu-latest`` github action. Not actually a
breaking change but a change in expectations that we're noting here. We
believe there is no code tied to the OS version in this library.

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chore: Update Requirements specifically to unpin the requests library

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feat: Adding python 3.11 and 3.12 support. Dropped django32 support.

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chore: Update Requirements

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feat: improve how we look for x-request-id headers to forward