⬆️ Update ruamel-yaml requirement from ~=0.18.7 to ~=0.18.8

Updates the requirements on ruamel-yaml to permit the latest version.

---
updated-dependencies:
- dependency-name: ruamel-yaml
  dependency-type: direct:production
...

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

requirements.txt

@@ -4,7 +4,7 @@ PyYAML~=6.0.2          # For themes files
 psutil~=6.1.1          # CPU / disk / network metrics
 pystray~=0.19.5        # Tray icon (all OS)
 babel~=2.16.0          # Date/time formatting
-ruamel.yaml~=0.18.7    # For configuration editor
+ruamel.yaml~=0.18.8    # For configuration editor
 sv-ttk~=2.6.0          # Tk Sun Valley theme for configuration editor
 tkinter-tooltip~=3.1.2 # Tooltips for configuration editor
 uptime~=3.0.1          # For System Uptime