fix: fixes serializeMultipartBody function signature

Author: Andrew Omondi

vitest.workspace.ts

@@ -1,4 +1,4 @@
-import { defineWorkspace, configDefaults } from 'vitest/config';
+import { defineWorkspace } from 'vitest/config';
 
 const workspace = defineWorkspace([
   'packages/abstractions',
@@ -7,4 +7,4 @@ const workspace = defineWorkspace([
   'packages/serialization/*'
 ])
 
-export default workspace;
+export default workspace;