Use Frozen collections instead of Immutable

Proprietary

Replace ToImmutableDictionary() with ToFrozenDictionary() and ToImmutableHashSet() with ToFrozenSet(). Frozen collections (.NET 8+) provide better read performance for collections populated once and read many times.

OpenRewrite.Recipes.CSharp.Migration.Dotnet.Net9.UseFrozenCollections

mod run . --recipe=OpenRewrite.Recipes.CSharp.Migration.Dotnet.Net9.UseFrozenCollections

Install it once, then run it on every repository under the current directory. New to the Moderne CLI? Set it up.