Update maturin requirement from <1.5,>=0.8.3 to >=0.8.3,<1.6 (#1117)

Updates the requirements on [maturin](https://github.com/pyo3/maturin) to permit the latest version.
- [Release notes](https://github.com/pyo3/maturin/releases)
- [Changelog](https://github.com/PyO3/maturin/blob/main/Changelog.md)
- [Commits](PyO3/maturin@v0.8.3...v1.5.0)

---
updated-dependencies:
- dependency-name: maturin
  dependency-type: direct:production
...

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pyproject.toml

@@ -29,7 +29,7 @@ dev = [
     "hypothesis>=4.36.0",
     "hypothesmith>=0.0.4",
     "jupyter>=1.0.0",
-    "maturin>=0.8.3,<1.5",
+    "maturin>=0.8.3,<1.6",
     "nbsphinx>=0.4.2",
     "prompt-toolkit>=2.0.9",
     "pyre-check==0.9.18; platform_system != 'Windows'",