Bump razor to 9.0.0-preview.25121.2

[ryzngard]

View Complete Diff of Changes

• Fix formatting of multi-line expressions in Html attributes (#11528) (PR: #11528)
• Cohost wireup (#11412) (PR: #11412)
• Stop attribute name parsing at transition (#11520) (PR: #11520)
• Use different comletion trigger character set for VSCode (#11446) (PR: #11446)
• Update AssemblyLoadingStrategy.md (#11509) (PR: #11509)
• [main] Update dependencies to ensure coherency (#11479) (PR: #11479)
• Prevent warnings from new IVTs from Roslyn (#11504) (PR: #11504)
• [main] Update dependencies from dotnet/source-build-reference-packages (#11503) (PR: #11503)
• Localized file check-in by OneLocBuild Task: Build definition ID 262: Build ID 2643004 (#11485) (PR: #11485)
• React to NuGet package pruning warnings (#11496) (PR: #11496)
• Add a couple of "stress tests" to the integration test project (#11481) (PR: #11481)
• Fix a couple of options in the old options screen (#11486) (PR: #11486)

[ryzngard]

@dibarbet heads up. Wanting to get this into prerelease for the completion and formatting fixes