update flutter sfa version

Author: AyushBherwani1998

src/common/sdk/sfa/flutter/_sfa-flutter-pubspec-install.mdx

@@ -1,4 +1,4 @@
 ```yaml
 dependencies:
-  single_factor_auth_flutter: ^5.2.0
+  single_factor_auth_flutter: ^5.3.0
 ```

src/common/versions.ts

@@ -10,7 +10,7 @@ export const sfaWebVersion = `9.2.x`;
 export const sfaAndroidVersion = `3.0.0`;
 export const sfaIOSVersion = `9.0.3`;
 export const sfaRNVersion = `2.0.x`;
-export const sfaFlutterVersion = `5.2.0`;
+export const sfaFlutterVersion = `5.3.0`;
 export const sfaNodeJSVersion = `7.4.x`;
 export const tkeyJSVersion = `15.x.x`;
 export const tkeyAndroidVersion = `0.0.5`;