[Wasm][net9] MSBuild `EmscriptenVersion` is still 3.1.34

[jeromelaban]

Description

When building with net9 for wasm, the reported emscripten version is 3.1.34 and should be 3.1.56 as the emscripten runtime pack mentions:

CompilerBinaryPath = /github/home/.dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Sdk.linux-x64/9.0.0-rc.2.24468.8/Sdk/../tools/emscripten/emcc

Reproduction Steps

Build a wasm app with .NET 9 RC2

Expected behavior

EmscriptenVersion is 3.1.56

Actual behavior

EmscriptenVersion is 3.1.34

Regression?

No.

Known Workarounds

Parsing the path in WasmClang to get the proper version.

Configuration

No response

Other information

No response

[lewing]

we'll have to fix this in servicing

[lewing]

@radekdoulik ptal

[dotnet-policy-service]

Tagging subscribers to 'arch-wasm': @lewing
See info in area-owners.md if you want to be subscribed.

[akoeplinger]

Reopening to track backport.