Bump maturin from 1.3.1 to 1.4.0 (#45)

Bumps [maturin](https://github.com/pyo3/maturin) from 1.3.1 to 1.4.0.
- [Release notes](https://github.com/pyo3/maturin/releases)
- [Changelog](https://github.com/PyO3/maturin/blob/main/Changelog.md)
- [Commits](PyO3/maturin@v1.3.1...v1.4.0)

---
updated-dependencies:
- dependency-name: maturin
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements_dev.txt

@@ -1,5 +1,5 @@
 citiespy==0.5.1
-maturin==1.3.1
+maturin==1.4.0
 pytest
 pytest-benchmark
 pytest-cov