Use mypy 0.14.1 for py3.8 compat

Author: agronholm

requirements.txt

@@ -15,7 +15,7 @@ twine==6.1.0
 # Tests & Linting
 coverage[toml]==7.5.4
 ruff==0.5.0
-mypy==1.16.1
+mypy==1.14.1
 trio-typing==0.10.0
 pytest==8.2.2
 pytest-httpbin==2.0.0