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@v6.14.2...v6.16.0)

---
updated-dependencies:
- dependency-name: pyinstaller
  dependency-version: 6.16.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -81,7 +81,7 @@ test = [
 packaging = [
     "build>=1.2.2,<2",
     "distro==1.9.* ; sys_platform == 'linux'",
-    "pyinstaller>=6.14.2,<6.16",
+    "pyinstaller>=6.14.2,<6.17",
     "pyinstaller-hooks-contrib==2025.*",
     "pypiwin32==223 ; sys_platform == 'win32'",
 ]