⬆️ Bump extern/qfr from `b250319` to `b837cff`

[dependabot[bot]]

Bumps extern/qfr from b250319 to b837cff.

Commits

• b837cff ⬆️🪝 update pre-commit hooks (#310)
• 1e4d4cc Bump codecov/codecov-action from 3.1.3 to 3.1.4 (#308)
• See full diff in compare view

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[burgholzer]

@dependabot rebase

[dependabot[bot]]

Superseded by #132.