Update Runtimes/Supplemental/StringProcessing/CMakeLists.txt to 6.2.1

Author: shahmishal

Runtimes/Supplemental/StringProcessing/CMakeLists.txt

@@ -10,7 +10,7 @@ if($ENV{BUILD_NUMBER})
 endif()
 project(SwiftStringProcessing
   LANGUAGES Swift C
-  VERSION 6.2.0${BUILD_NUMBER})
+  VERSION 6.2.1${BUILD_NUMBER})
 
 if(NOT PROJECT_IS_TOP_LEVEL)
   message(FATAL_ERROR "Swift StringProcessing must build as a standalone project")