Update blacksheep_app.py

per litestar-org#36

Author: Glinte

frameworks/blacksheep_app.py

@@ -347,9 +347,9 @@ def __init__(self, two: SyncDependencyTwo) -> None:
         self.value = [*two.value, "sync_dependency_three"]
 
 
-app.services.add_exact_scoped(SyncDependencyOne)
-app.services.add_exact_scoped(SyncDependencyTwo)
-app.services.add_exact_scoped(SyncDependencyThree)
+app.services._add_exact_scoped(SyncDependencyOne)
+app.services._add_exact_scoped(SyncDependencyTwo)
+app.services._add_exact_scoped(SyncDependencyThree)
 
 
 @app.router.get("/sync-dependencies-sync")