Update VS Platform NuGet package version

…data ID

RC2 builds of the .NET 7.0 SDK have generators that depend on 4.4
assemblies, so you'll get warnings without this.

Merge release/dev17.4 to main

…s and parameter default values. (#64634)

Part 1. 
Do not expose C# member semantic models directly to external consumers.
This could occur when member semantic models were used to support/represent speculative semantic models.
Now we expose ```SpeculativeSemanticModelWithMemberModel``` instead 

Part 2.
SpeculativeSemanticModelWithMemberModel - create child member models for attributes and parameter default values.

Fixes #60801.
Fixes #24135.

Upgrade our compiler to 4.4.0-2.final

Cache indices against our PEReference object, not the underlying metadata ID