fix error message

Signed-off-by: Vladimir Petrusevici <[email protected]>

Author: Vladimir Petrusevici

src/OpenFeature.Contrib.Providers.Flagsmith/FlagsmithProvider.cs

@@ -76,7 +76,7 @@ private async Task<ResolutionDetails<T>> ResolveValue<T>(string flagKey, T defau
             {
                 return new ResolutionDetails<T>(flagKey, parsedValue);
             }
-            throw new TypeMismatchException("Failed to parse value in boolean type");
+            throw new TypeMismatchException("Failed to parse value in the expected type");
 
         }