feat: speed up spawn-phase ring pulse for better visibility

Bump spawnOverlay animSpeed 0.005 -> 0.008 so the breathing pulse on
spawn-phase highlight rings cycles faster, making own and teammate spawn
locations easier to spot. Addresses reports that players had trouble
finding their teammates during the spawn phase in team games.

src/client/render/gl/render-settings.json

@@ -315,7 +315,7 @@
     "selfMaxRad": 30,
     "mateMinRad": 5,
     "mateMaxRad": 14,
-    "animSpeed": 0.005,
+    "animSpeed": 0.008,
     "gradientInnerEdge": 0.01,
     "gradientSolidEnd": 0.1
   },