chore: restore a green pre-commit run

CHANGELOG.md

@@ -130,6 +130,3 @@ Bug Fixes
 ## [v1.4](https://github.com/PyCQA/docformatter/tree/v1.4) (2020-12-27)
 
 [Full Changelog](https://github.com/PyCQA/docformatter/compare/v1.3.1...v1.4)
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-
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src/docformatter/classify.py

@@ -478,10 +478,10 @@ def is_newline_continuation(
 
 
 def _is_blank_line(line: str) -> bool:
-    """Determine if a physical line is blank.
+    r"""Determine if a physical line is blank.
 
     A blank line is a non-empty line that holds nothing but whitespace, e.g.
-    "\\n" or "    \\n".  The empty string is *not* a blank line; tokenize uses
+    "\n" or "    \n".  The empty string is *not* a blank line; tokenize uses
     it as the line of the NEWLINE token it synthesizes for source that has no
     trailing newline, as well as for DEDENT and ENDMARKER tokens.
 

src/docformatter/configuration.py

@@ -43,7 +43,7 @@
 except ImportError:
     # Neither the stdlib tomllib (Python < 3.11) nor the tomli backport is
     # available; TOML configuration files are skipped in that case. See #368.
-    tomllib = None
+    tomllib = None  # type: ignore[assignment]
 
 # docformatter Package Imports
 from docformatter import __pkginfo__