✨ Update type annotations and upgrade mypy (#173)

pyproject.toml

@@ -37,7 +37,7 @@ sqlalchemy2-stubs = {version = "*", allow-prereleases = true}
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.2.4"
-mypy = "^0.812"
+mypy = "^0.910"
 flake8 = "^3.9.2"
 black = {version = "^21.5-beta.1", python = "^3.7"}
 mkdocs = "^1.2.1"
@@ -98,3 +98,7 @@ warn_return_any = true
 implicit_reexport = false
 strict_equality = true
 # --strict end
+
+[[tool.mypy.overrides]]
+module = "sqlmodel.sql.expression"
+warn_unused_ignores = false