MNT: Fix CI with mypy 0.800

Namely improvements to finding namespace modules
(failing test pdoc.test.ApiTest.test_namespace):
https://mypy-lang.blogspot.com/2021/01/mypy-0800-released.html
python/mypy#4675 (comment)

Author: kernc

.github/workflows/ci.yml

@@ -59,7 +59,7 @@ jobs:
         run: |
           find -name '*.md' | xargs .github/lint-markdown.sh
           flake8
-          mypy pdoc
+          mypy -p pdoc
           time coverage run -m unittest -v pdoc.test
           PDOC_TEST_PANDOC=1 time catchsegv python -m unittest -v pdoc.test.CliTest.test_pdf_pandoc
           bash <(curl -s https://codecov.io/bash)

pdoc/html_helpers.py

@@ -84,10 +84,10 @@ def glimpse(text: str, max_length=153, *, paragraph=True,
     ],
     extension_configs={
         "markdown.extensions.smarty": dict(
-            smart_dashes=True,          # type: ignore[dict-item]
-            smart_ellipses=True,        # type: ignore[dict-item]
-            smart_quotes=False,         # type: ignore[dict-item]
-            smart_angled_quotes=False,  # type: ignore[dict-item]
+            smart_dashes=True,
+            smart_ellipses=True,
+            smart_quotes=False,
+            smart_angled_quotes=False,
         ),
     },
 )
@@ -417,10 +417,10 @@ def to_html(text: str, *,
     example template.
     """
     # Optionally register our math syntax processor
-    if not latex_math and _MathPattern.NAME in _md.inlinePatterns:         # type: ignore
-        _md.inlinePatterns.deregister(_MathPattern.NAME)                   # type: ignore
-    elif latex_math and _MathPattern.NAME not in _md.inlinePatterns:       # type: ignore
-        _md.inlinePatterns.register(_MathPattern(_MathPattern.PATTERN),    # type: ignore
+    if not latex_math and _MathPattern.NAME in _md.inlinePatterns:
+        _md.inlinePatterns.deregister(_MathPattern.NAME)
+    elif latex_math and _MathPattern.NAME not in _md.inlinePatterns:
+        _md.inlinePatterns.register(_MathPattern(_MathPattern.PATTERN),
                                     _MathPattern.NAME,
                                     _MathPattern.PRIORITY)