revert mypy to 0.991

see: #364
Signed-off-by: Jos Verlinde <[email protected]>

Author: Josverl

poetry.lock

@@ -8,7 +8,7 @@ repo-path = "./repos"
 
 [tool.poetry]
 name = "micropython-stubber"
-version = "1.13.1post1"
+version = "1.13.2"
 description = "Tooling to create and maintain stubs for MicroPython"
 authors = ["Jos Verlinde <[email protected]>"]
 license = "MIT"
@@ -42,7 +42,7 @@ pyboard = "stubber.tools.pyboard:main"
 python = ">=3.8,<3.12"
 python-minifier = "^2.7.0"
 requests = "^2.28.0"
-mypy = ">=0.991,<1.1"
+mypy = "0.991"
 black = ">=22.10,<23.0"
 libcst = "^0.4.9"
 autoflake = ">=1.7,<3.0"