Bump support packages and update logging.

[freakboy3742]

Update the support packages to the latest versions, and apply

macOS 26 has altered how logging operates, so NSLog messages now appear in the system log as <private>.

To work around this, we need to use an updated version of std-nslog which uses os_log rather than NSLog. However, this requires a binary module, which means the logger can't be loaded until app_packages has been added to the site path.

However - as of Python 3.14, the functionality of std-nslog is baked into Python by default. As long as you're using 3.14.6+, you can get all of the functionality of std-nslog without importing the package.

So, this PR disables the use of the nslog shim loader entirely on 3.14 or newer, and re-orders the addition of the shim on Python 3.13 and earlier.

Also updates the README into no-newlines format.

The macOS app stub will need to be re-tagged once this PR lands.

Building this template requires an in development version of Briefcase (beeware/briefcase#2877); this adds std-nslog 2.0.0 as a dependency on macOS.

briefcase-repo: https://github.com/freakboy3742/briefcase.git
briefcase-ref: apple-logs

PR Checklist:

• I will abide by the BeeWare Code of Conduct
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• This PR was generated or assisted using an AI tool