Adds support for threading lock in .NET 9 and C# 13#319

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michaelstonis wants to merge 2 commits intoCysharp:mainfrom

michaelstonis:net9-lock-polyfill

Commits on Mar 29, 2025

Merge remote-tracking branch 'upstream/main' into net9-lock-polyfill
michaelstonis
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Update locking mechanism and language version
michaelstonis
committed