Update objc2-foundation requirement from 0.2.2 to 0.3.1

[dependabot[bot]]

Updates the requirements on objc2-foundation to permit the latest version.

Commits

• e68410e Merge pull request #741 from madsmtm/ci-full
• 3da8ade Add example of testing version range with available! macro
• 995b589 Fix CFURL tests on different platforms
• 032ec42 Fix running test-frameworks
• f90e81b Fix GNUStep CI
• 532bca0 Bump framework crates 0.3.0 -> 0.3.1
• 80e7101 Bump dispatch2 0.2.0 -> 0.3.0
• 1498762 Bump block2 0.6.0 -> 0.6.1
• 114fb5b Bump objc2 0.6.0 -> 0.6.1
• 4ba11f7 Fix changelog entries
• Additional commits viewable in compare view

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