Mac build error from briefcase

[kushaldas]

briefcase create

The directory build/tugpgp/macos/app already exists; overwrite [y/N]? y

[tugpgp] Removing old application template...

[tugpgp] Generating application template...
Using app template: https://github.com/beeware/briefcase-macOS-app-template.git, branch v0.3.25
Using existing template (sha 10d36c8512e92d3ee4b3be2579a47300ac8f844d, updated Sun Aug 10 10:12:59 2025)

[tugpgp] Installing support package...
Using support package https://briefcase-support.s3.amazonaws.com/python/3.13/macOS/Python-3.13-macOS-support.b10.tar.gz
Python-3.13-macOS-support.b10.tar.gz already downloaded
Unpacking support package... done
Copying standard library into app bundle... done

[tugpgp] Installing stub binary...
Using stub binary https://briefcase-support.s3.amazonaws.com/python/3.13/macOS/GUI-Stub-3.13-b12.zip
GUI-Stub-3.13-b12.zip already downloaded
Installing stub binary... done

[tugpgp] Installing application code...
Installing src/tugpgp... done

[tugpgp] Installing requirements...
ERROR: Ignored the following versions that require a different python version: 6.2.2 Requires-Python >=3.6,<3.11; 6.2.2.1 Requires-Python >=3.6,<3.11; 6.2.3 Requires-Python >=3.6,<3.11; 6.2.4 Requires-Python >=3.6,<3.11; 6.3.0 Requires-Python >=3.6,<3.11; 6.3.1 Requires-Python >=3.6,<3.11; 6.3.2 Requires-Python >=3.6,<3.11; 6.4.0.1 Requires-Python >=3.7,<3.12; 6.4.1 Requires-Python >=3.7,<3.12; 6.4.2 Requires-Python >=3.7,<3.12; 6.4.3 Requires-Python >=3.7,<3.12; 6.5.0 Requires-Python >=3.7,<3.12; 6.5.1 Requires-Python >=3.7,<3.12; 6.5.1.1 Requires-Python >=3.7,<3.12; 6.5.2 Requires-Python >=3.7,<3.12; 6.5.3 Requires-Python >=3.7,<3.12; 6.6.0 Requires-Python >=3.8,<3.13; 6.6.1 Requires-Python >=3.8,<3.13; 6.6.2 Requires-Python >=3.8,<3.13; 6.6.3 Requires-Python >=3.8,<3.13; 6.6.3.1 Requires-Python >=3.8,<3.13; 6.7.0 Requires-Python >=3.9,<3.13; 6.7.1 Requires-Python >=3.9,<3.13; 6.7.2 Requires-Python >=3.9,<3.13; 6.7.3 Requires-Python >=3.9,<3.13
ERROR: Could not find a version that satisfies the requirement PySide6 (from versions: none)
ERROR: No matching distribution found for PySide6
Installing app requirements... errored

Unable to install requirements. This may be because one of your
requirements is invalid, or because pip was unable to connect
to the PyPI server.

This is happening even after removing any version requirement from pyproject.toml file in the https://github.com/SUNET/tugpgp/tree/version_update branch.