Use Asphalt master instead of the 5.0 branch for mypy

Author: agronholm

.pre-commit-config.yaml

@@ -27,7 +27,7 @@ repos:
     hooks:
       - id: mypy
         additional_dependencies:
-          - asphalt@git+https://github.com/asphalt-framework/asphalt@5.0
+          - asphalt@git+https://github.com/asphalt-framework/asphalt
           - pytest
 
   - repo: https://github.com/pre-commit/pygrep-hooks