pyproject.toml: Update mypy and remove pydantic.mypy

* This fixes a bug related to mypy detecting wrong python version being
  used when analysing some modules

Author: joaomariolago

pyproject.toml

@@ -25,7 +25,7 @@ dependencies = [
 dev = [
     "black==22.3.0",
     "isort==5.10.1",
-    "mypy==0.941",
+    "mypy==0.981",
     "pydantic==1.9.0",
     "pylint==2.14.5",
     "types-Markdown==3.6.0.20240316",
@@ -66,4 +66,3 @@ ignore_missing_imports = true
 strict = true
 warn_unreachable = true
 warn_unused_ignores = false
-plugins = "pydantic.mypy"