chore: bump mypy, move config from pre-commit

Bumps mypy to latest version, 0.991.

Config for mypy is moved from the pre-commit hook definition to
mypy.ini, and in addition `pretty = True` is set to show more human
friendly error messages.

.pre-commit-config.yaml

@@ -25,16 +25,11 @@ repos:
         files: \.py$
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.942
+    rev: v0.991
     hooks:
       - id: mypy
         name: Mypy Karapace
         pass_filenames: false
-        args:
-          - "--show-error-codes"
-          - "--ignore-missing-imports"
-          - "--package"
-          - "karapace"
 
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.1.0

mypy.ini

@@ -1,5 +1,8 @@
 [mypy]
 python_version = 3.7
+packages = karapace
+show_error_codes = True
+pretty = True
 warn_redundant_casts = True
 ignore_errors = False
 disallow_untyped_defs = True