Fix sphinx-doc__sphinx-9711

[piyushhhxyz]

Fix: needs_extensions checks versions using strings

Problem

The needs_extensions check in sphinx/extension.py compared version strings lexicographically (reqversion > extension.version). This causes incorrect rejections when version numbers have components >= 10, e.g., '0.6' > '0.10' is True as a string comparison, but 0.6 < 0.10 semantically.

Fix

Changed the version comparison on line 54 of sphinx/extension.py to use packaging.version.parse() for proper semantic version comparison instead of raw string comparison.

Changes

• sphinx/extension.py: Import packaging.version.parse and use it to compare reqversion and extension.version in verify_needs_extensions().

Testing

Verified that parse_version('0.6') > parse_version('0.10') correctly returns False (whereas string comparison '0.6' > '0.10' incorrectly returns True).