Bump pyfxa from 0.7.5 to 0.7.6 in /requirements (#14903)
Bump pyfxa from 0.7.5 to 0.7.6 in /requirements (#14903)

Bumps [pyfxa](https://github.com/mozilla/PyFxA) from 0.7.5 to 0.7.6.
- [Release notes](https://github.com/mozilla/PyFxA/releases)
- [Changelog](https://github.com/mozilla/PyFxA/blob/main/CHANGES.txt)
- [Commits](https://github.com/mozilla/PyFxA/compare/v0.7.5...v0.7.6)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
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