chore(deps): bump pyinstaller from 6.8.0 to 6.9.0 in /requirements

Bumps [pyinstaller](https://github.com/pyinstaller/pyinstaller) from 6.8.0 to 6.9.0.
- [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
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements/pyinstaller-build.txt

@@ -1,3 +1,3 @@
 # Executable binary builder requirements
 setuptools==70.3.0
-pyinstaller==6.8.0
+pyinstaller==6.9.0