⬆️ Update sv-ttk requirement from ~=2.6.0 to ~=2.6.1

Updates the requirements on [sv-ttk](https://github.com/rdbende/Sun-Valley-ttk-theme) to permit the latest version.
- [Release notes](https://github.com/rdbende/Sun-Valley-ttk-theme/releases)
- [Commits](rdbende/Sun-Valley-ttk-theme@v2.6.0...v2.6.1)

---
updated-dependencies:
- dependency-name: sv-ttk
  dependency-version: 2.6.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -5,7 +5,7 @@ psutil~=7.0.0          # CPU / disk / network metrics
 pystray~=0.19.5        # Tray icon (all OS)
 babel~=2.17.0          # Date/time formatting
 ruamel.yaml~=0.18.14    # For configuration editor
-sv-ttk~=2.6.0          # Tk Sun Valley theme for configuration editor
+sv-ttk~=2.6.1          # Tk Sun Valley theme for configuration editor
 tkinter-tooltip~=3.1.2 # Tooltips for configuration editor
 uptime~=3.0.1          # For System Uptime 
 requests~=2.32.4       # HTTP library