Update dependency mypy to v1.5.0

Author: renovate[bot]

poetry.lock

@@ -26,7 +26,7 @@ datasette-sqlite-http = "==0.1.1"
 datasette-vega = "==0.6.2"
 faker = "==19.3.0"
 flake8 = "==6.1.0"
-mypy = "==1.4.1"
+mypy = "==1.5.0"
 pytest = "==7.4.0"
 pytest-asyncio = "==0.21.1"
 pytest-cov = "==4.1.0"