Bump protobuf from 5.29.3 to 6.31.1

[dependabot[bot]]

Bumps protobuf from 5.29.3 to 6.31.1.

Commits

• 74211c0 Updating version.json and repo version numbers to: 31.1
• 63fa9ab Merge pull request #21978 from shaod2/31.1-cp
• bec5b5a Add missing copts attribute (#21982)
• 96a9ef6 Fix cmake staleness test
• 3419598 Support allowing late injection of language feature set defaults from Feature...
• 0fe099a python pyi print "import datetime" for Duration/Timestamp field (#21885)
• f156008 Merge pull request #21861 from shaod2/py-cp-31
• a3921fb Add recursion depth limits to pure python
• ac94456 Merge pull request #21744 from protocolbuffers/31.x-202505141617
• f275995 Updating version.json and repo version numbers to: 31.1-dev
• Additional commits viewable in compare view

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