build(deps): bump sv-ttk from 2.5.5 to 2.6.0

Bumps [sv-ttk](https://github.com/rdbende/Sun-Valley-ttk-theme) from 2.5.5 to 2.6.0.
- [Release notes](https://github.com/rdbende/Sun-Valley-ttk-theme/releases)
- [Commits](https://github.com/rdbende/Sun-Valley-ttk-theme/commits/v2.6.0)

---
updated-dependencies:
- dependency-name: sv-ttk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -15,7 +15,7 @@ GitPython = "^3.1.41"
 tkextrafont = "^0.6.3"
 Pygments = "^2.17.2"
 toml = "^0.10.2"
-sv-ttk = "^2.5.5"
+sv-ttk = "^2.6.0"
 Pillow = "^10.2.0"
 requests = "^2.31.0"