build(deps): update pyinstaller requirement

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...v6.12.0)

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

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

Author: dependabot[bot]

requirements/packaging.txt

@@ -1,6 +1,6 @@
 # Packaging
 # ---------
 
-pyinstaller>=6.8.0,<6.12
+pyinstaller>=6.8.0,<6.13
 pyinstaller-hooks-contrib==2025.*
 pypiwin32==223 ; sys_platform == 'win32'