fix: Rounded edges of color sections of identity rings (#3968)

* fix: Rounded edges of color sections of identity rings

* bump version

VERSION

@@ -1 +1 @@
-0.166.2
+0.166.3

protocol/identity/ring/ring.go

@@ -76,6 +76,7 @@ func DrawRing(param *DrawRingParam) ([]byte, error) {
 		dc.SetHexColor(colors[param.ColorHash[i][1]])
 		dc.DrawArc(float64(param.Width/2), float64(param.Height/2), radius, arcPos, arcPos+unitRadLen*float64(param.ColorHash[i][0]))
 		dc.SetLineWidth(ringPxSize)
+		dc.SetLineCapButt()
 		dc.Stroke()
 		arcPos += unitRadLen * float64(param.ColorHash[i][0])
 	}