build(deps-dev): update pywebview requirement from <6,>=5.0 to >=5.0,<7

Updates the requirements on [pywebview](https://github.com/r0x0r/pywebview) to permit the latest version.
- [Release notes](https://github.com/r0x0r/pywebview/releases)
- [Changelog](https://github.com/r0x0r/pywebview/blob/master/docs/CHANGELOG.md)
- [Commits](r0x0r/pywebview@5.0.1...6.2.1)

---
updated-dependencies:
- dependency-name: pywebview
  dependency-version: 6.2.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -26,7 +26,7 @@ dependencies = [
 [project.optional-dependencies]
 # Desktop launcher (pywebview pulls in heavy system libs — GTK/Qt on Linux —
 # so it is intentionally excluded from the web-server and CI installs).
-desktop = ["pywebview>=5.0,<6"]
+desktop = ["pywebview>=5.0,<7"]
 
 # Development tooling: testing + type checking.
 dev = [