Bump textual from 5.3.0 to 6.4.0

Bumps [textual](https://github.com/Textualize/textual) from 5.3.0 to 6.4.0.
- [Release notes](https://github.com/Textualize/textual/releases)
- [Changelog](https://github.com/Textualize/textual/blob/main/CHANGELOG.md)
- [Commits](https://github.com/Textualize/textual/compare/v5.3.0...v6.4.0)

---
updated-dependencies:
- dependency-name: textual
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -4,7 +4,7 @@ async-cache==1.1.1
 pyytlounge==2.3.0
 rich==14.1.0
 ssdp==1.3.1
-textual==5.3.0
+textual==6.4.0
 textual-slider==0.2.0
 xmltodict==0.15.1
 rich_click==1.8.9