Add type hints

Author: rjduffner

Diff for: opentelemetry-instrumentation/src/opentelemetry/instrumentation/dependencies.py

@@ -40,6 +40,8 @@ def __str__(self):
 
 
 class DependencyConflictError(Exception):
+    conflict: DependencyConflict
+
     def __init__(self, conflict: DependencyConflict):
         self.conflict = conflict