Bump Razor to 9.0.0-preview.24555.12

[davidwengier]

The previous bump was because of a serialization change from v6 to v7. Sadly RPS meant that change got reverted, so this takes us back to v6.

I suspect we'll be back at v7 soon, but preparing this so Razor insertions are not otherwise blocked.

[dibarbet]

@davidwengier does this need to go in before we can insert roslyn into vscode? theres a high pri change we need to get in before snap on friday

[davidwengier]

No, current inserted razor works with current builds of Roslyn. This will be needed if we have to take a newer razor though

[dibarbet]

No, current inserted razor works with current builds of Roslyn. This will be needed if we have to take a newer razor though

We will be taking a newer version of Razor for the telemetry fix as well - this is the change - dotnet/razor#11181

@davidwengier if this change is required for that, please merge (otherwise hold off)

[davidwengier]

I think @ryzngard did the right thing with that one, I think it should be fine to not take this. In fact, taking this would break that!

[ryzngard]

I think @ryzngard did the right thing with that one, I think it should be fine to not take this. In fact, taking this would break that!

They in fact did not....