Bump Polyfill from 5.6.0 to 6.0.0 in /src

[dependabot[bot]]

Bumps Polyfill from 5.6.0 to 6.0.0.

Commits

• 9ba1813 Update Directory.Build.props
• ac82217 Update Directory.Build.props
• 81fdf1f require at least version 4.5.5 of System.Memory (#195)
• 4838c6e Update Polyfill.targets
• 5e0436a move from WithMetadataValue to AnyHaveMetadataValue (#194)
• a6bfffd Update .editorconfig
• 51fcc42 refs and cleanup
• ead701f refs or cleanup
• c2c7353 refs and cleanup
• d48f9c5 Merge branch 'main' of https://github.com/SimonCropp/Polyfill
• Additional commits viewable in compare view

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