⬆️ Update pyinstaller requirement from ~=6.19.0 to ~=6.20.0

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@v6.19.0...v6.20.0)

---
updated-dependencies:
- dependency-name: pyinstaller
  dependency-version: 6.20.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -9,7 +9,7 @@ sv-ttk~=2.6.1          # Tk Sun Valley theme for configuration editor
 tkinter-tooltip~=3.1.2 # Tooltips for configuration editor
 uptime~=3.0.1          # For System Uptime
 ping3~=5.1.5           # ICMP ping implementation using raw socket
-pyinstaller~=6.19.0    # bundles a Python application and all its dependencies into a single package
+pyinstaller~=6.20.0    # bundles a Python application and all its dependencies into a single package
 pyusb~=1.3.1           # For TURZX USB models: communicate directly through USB
 pycryptodome~=3.23.0   # For TURZX USB models: decrypt/encrypt frames using DES