Enable the RUF048 lint in Ruff

.ruff.toml

@@ -264,7 +264,7 @@ select = [
     "RUF041",  # Unnecessary nested `Literal`
     "RUF043",  # Pattern passed to `match=` contains metacharacters but is neither escaped nor raw
     "RUF046",  # Value being casted is already an integer
-#    "RUF048",  # `__version__` may contain non-integral-like elements
+    "RUF048",  # `__version__` may contain non-integral-like elements
     "RUF055",  # Plain string pattern passed to `re` function
 #    "RUF100",  # Unused `noqa` directive
     "RUF101",  # `{original}` is a redirect to `{target}`

sphinx/highlighting.py

@@ -31,7 +31,7 @@ if TYPE_CHECKING:
     from pygments.lexer import Lexer
     from pygments.style import Style
 
-if tuple(map(int, pygments.__version__.split('.')))[:2] < (2, 18):
+if tuple(map(int, pygments.__version__.split('.')[:2])) < (2, 18):
     from pygments.formatter import Formatter  # NoQA: F811
 
     Formatter.__class_getitem__ = classmethod(lambda cls, name: cls)  # type: ignore[attr-defined]

tests/test_highlighting.py

@@ -12,7 +12,7 @@ from pygments.token import Name, Text
 
 from sphinx.highlighting import PygmentsBridge
 
-if tuple(map(int, pygments.__version__.split('.')))[:2] < (2, 18):
+if tuple(map(int, pygments.__version__.split('.')[:2]))[:2] < (2, 18):
     from pygments.formatter import Formatter
 
     Formatter.__class_getitem__ = classmethod(lambda cls, name: cls)  # type: ignore[attr-defined]

tests/test_util/test_util_i18n.py

@@ -7,15 +7,12 @@ import os
 import time
 from pathlib import Path
 
-import babel
 import pytest
 from babel.messages.mofile import read_mo
 
 from sphinx.errors import SphinxError
 from sphinx.util import i18n
 
-BABEL_VERSION = tuple(map(int, babel.__version__.split('.')))
-
 
 def test_catalog_info_for_file_and_path():
     cat = i18n.CatalogInfo('path', 'domain', 'utf-8')