Update PyO3 to 0.27.1 and Rust edition to 2021#7

cjermain merged 1 commit intomaincjermain/rust-python-coverage:mainfrom

claude/pyo3-027-011CUYo18ZqbutpJ67DM6jabcjermain/rust-python-coverage:claude/pyo3-027-011CUYo18ZqbutpJ67DM6jabCopy head branch name to clipboard