build(deps): update pyinstaller requirement from <6.7,>=5 to >=5,<6.9

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@v5.0...v6.8.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements/packaging.txt

@@ -3,6 +3,6 @@
 
 build>=0.9,<2
 distro==1.9.* ; sys_platform == 'linux'
-pyinstaller>=5,<6.7
+pyinstaller>=5,<6.9
 pyinstaller-hooks-contrib==2024.*
 pypiwin32==223 ; sys_platform == 'win32'