Upgrade textual and python

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• Upgrading textual to 0.82.0 required minor Python version bump
• Minimal change required due to namespace_bindings rename to active_bindings in Textual 0.61.0
• Limited post upgrade testing.
  • Performed manual smoke test by piping tree into tl and reading a python log file

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More testing required - tailing is not working

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Reopening the PR as tail is working when tl is executed stand alone.
Tail was not working when I had embedded it in another app.

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Discovered this issue while testing the PR with toolong embedded in another app.
I'll have a look at it to make sure it does not impact stand alone usage.

I suspect it will as

App.check_bindings is now private
https://github.com/Textualize/textual/blob/main/CHANGELOG.md#0690---2024-06-16

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tested that the following are working using Python 3.12.7

• passing multiple log files
  • tabbed
    tl ../logs/app.log ../logs/app.log.2
  • merged
    tl --merge ../logs/app.log ../logs/app.log.2
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