[Docs] Update SPM minimum target dependency version 1.2.0 -> 1.2.1

Author: SHcommit

README.md

@@ -53,7 +53,7 @@ Finally, add `Import SHFirestoreService` to your source code.
 ## Minimum Requirements
 | SHFirestoreService       | Date         | Swift        | Platforms                           |
 |------------|--------------|-------------|-----------------------------------------------|
-| SHCoordinator 1.2.0  | May 2, 2024  | Swift 5.0   | iOS 13.0 |
+| SHCoordinator 1.2.1  | May 2, 2024  | Swift 5.0   | iOS 13.0 |
 
 
 ## Author