python3-setuptools-rust: upgrade 1.7.0 -> 1.8.1

python3-setuptools-rust: upgrade 1.7.0 -> 1.8.1

Changelog:
===========
-Fix regression in install_extension crashing since 1.8.0. #380
-Drop support for Python 3.7. #357
-Remove direct imports from pkg_resources. #359
-Add support for setting a custom cargo profile with the
 SETUPTOOLS_RUST_CARGO_PROFILE environment variable. #364

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>