[3.13] gh-142859: Add Tools/check-c-api-docs to mypy check (GH-142860) (#142870)

gh-142859: Add `Tools/check-c-api-docs` to mypy check (GH-142860)
(cherry picked from commit 248eb3efb3)

Co-authored-by: sobolevn <mail@sobolevn.me>

.github/workflows/mypy.yml

@@ -23,6 +23,7 @@ on:
       - "Tools/build/update_file.py"
       - "Tools/build/umarshal.py"
       - "Tools/cases_generator/**"
+      - "Tools/check-c-api-docs/**"
       - "Tools/clinic/**"
       - "Tools/jit/**"
       - "Tools/peg_generator/**"
@@ -55,6 +56,7 @@ jobs:
           "Lib/tomllib",
           "Tools/build",
           "Tools/cases_generator",
+          "Tools/check-c-api-docs",
           "Tools/clinic",
           "Tools/jit",
           "Tools/peg_generator",

Tools/check-c-api-docs/mypy.ini

@@ -0,0 +1,19 @@
+[mypy]
+files = Tools/check-c-api-docs/
+pretty = True
+
+# We need `_colorize` import:
+mypy_path = $MYPY_CONFIG_FILE_DIR/../../Misc/mypy
+
+# Make sure Python can still be built
+# using Python 3.13 for `PYTHON_FOR_REGEN`...
+python_version = 3.13
+
+# ...And be strict:
+strict = True
+extra_checks = True
+enable_error_code = 
+    ignore-without-code,
+    redundant-expr,
+    truthy-bool,
+    possibly-undefined,