Update color from blue to #99bfff

Following Qubes Visual Style Guide https://www.qubes-os.org/doc/visual-style-guide/

(cherry picked from commit 6668f4d)

qui/devices/actionable_widgets.py

@@ -411,7 +411,7 @@ def __init__(self, device: backend.Device, variant: str = 'dark'):
         label_markup = device.name
         if (device.connection_timestamp and
                 int(time.monotonic() - device.connection_timestamp) < 120):
-            label_markup += ' <span foreground="blue"><b>NEW</b></span>'
+            label_markup += ' <span foreground="#99bfff"><b>NEW</b></span>'
         self.device_label.set_markup(label_markup)
 
         if self.device.attachments: