Upgrade textual and python

[bluefing]

• 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

[bluefing]

More testing required - tailing is not working

[bluefing]

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.

[bluefing]

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

[bluefing]

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
• Find
  • Regex and case sensitive search
  • previous and next
• Go to
• Line nos
• Help
• Mouse (scroll and shift-scroll) and keyboard navigation (g, shift-g, page-up/down, arrow keys)
• Overlay