Update pyinstaller requirement from 6.8.0 to 6.9.0 (#81)

Updates the requirements on [pyinstaller](https://github.com/pyinstaller/pyinstaller) to permit the latest version.
- [Release notes](https://github.com/pyinstaller/pyinstaller/releases)
- [Changelog](https://github.com/pyinstaller/pyinstaller/blob/develop/doc/CHANGES.rst)
- [Commits](pyinstaller/pyinstaller@v6.8.0...v6.9.0)

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

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

pyproject.toml

@@ -8,7 +8,7 @@ readme = "README.md"
 [tool.poetry.dependencies]
 python = ">=3.9,<3.12"
 urllib3 = "2.2.2"
-pyinstaller = "6.8.0"
+pyinstaller = "6.9.0"
 wheel = "^0.43.0"