httpcore
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really drop python<=3.7 support
Summary
Filter all code over pyupgrade --py38
.
Checklist
- [x] I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
- [ ] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
- [ ] I've updated the documentation accordingly.