Update flexShrink type to support string values

Author: Rogin Farrer

.changeset/serious-phones-itch.md

@@ -0,0 +1,5 @@
+---
+'rainbow-sprinkles': patch
+---
+
+Update flexShrink type to support string values

packages/rainbow-sprinkles/src/css.d.ts

@@ -8279,7 +8279,7 @@ export namespace Property {
 
   export type FlexGrow = OnlyStringNumeric;
 
-  export type FlexShrink = OnlyNumber;
+  export type FlexShrink = OnlyStringNumeric;
 
   export type FlexWrap = 'nowrap' | 'wrap' | 'wrap-reverse';