Rename mypy script to avoid version conflict (#245)

This should solve: #238

Author: rbs333

.github/workflows/lint.yml

@@ -43,4 +43,4 @@ jobs:
         poetry run check-format
     - name: check-mypy
       run: |
-        poetry run mypy
+        poetry run check-mypy

CONTRIBUTING.md

@@ -44,7 +44,7 @@ Check formatting, linting, and typing:
 ```bash
 poetry run format
 poetry run sort-imports
-poetry run mypy
+poetry run check-mypy
 ```
 
 #### TestContainers