Update roslyn to 5.9.0-1.26303.15

[JoeRobich]

View Complete Diff of Changes

• Fix Razor diagnostics exception when HTML diagnostic range exceeds SourceText bounds (PR: #84002)
• Use MEF services in VS Code cohost tests (PR: #83986)
• Implement runtime async support for dynamic (PR: #83713)
• Remove IDynamicFileInfoProvider and related code (PR: #83928)
• Add IAsyncLifetime overhead adjustment to test scheduling (PR: #83915)
• Move a couple of helpers to the remote project (PR: #83990)
• Unsafe evolution: consolidate reserved attributes (PR: #83908)
• Fix rename in VS Code from a C# document (PR: #83971)
• Remove invalid casts in PairedExtensionOperatorSignatureComparer (PR: #83934)
• Remove the state from MSBuildDiagnosticLogger (PR: #83977)
• Unions: not pattern is applied to the incoming value itself (PR: #83904)
• Complete server shutdown when mutex is closed (PR: #83921)
• Fix some missing attributes on partial async and iterator methods (PR: #83790)
• Unsafe evolution: safe/unsafe externs (PR: #83661)
• Use params ImmutableArray<T> on all applicable public APIs. (PR: #83858)
• Unsafe evolution: avoid unnecessary diagnostics on params collection declarations (PR: #83641)
• Cache Razor cohost MEF setup across tests (PR: #83936)
• Consolidate Linked Editing Range up to its callers (PR: #83956)
• Consolidate Semantic Tokens code up to where it should be (PR: #83955)
• Consolidate Diagnostics code up into Remote.Razor (PR: #83951)
• Consolidate Rename code up into Remote.Razor (PR: #83950)
• Consolidate Document Symbols code up into Remote.Razor (PR: #83949)
• Consolidate Folding Ranges code up into Remote.Razor (PR: #83948)
• Consolidate Spell Check code up into Remote.Razor (PR: #83947)
• Per server workspace and project factories (PR: #83857)
• Fix marketplace name for dotnet/skills (PR: #83961)
• Only add reference counts on CodeLens elements that are supported (PR: #82641)
• [main] Update dependencies from dotnet/arcade (PR: #83941)
• Closed classes: add a few interface matching tests (PR: #83940)
• Fix x86 test host OOM in TemporaryStorageService (PR: #83952)
• Change insertionCreateDraftPR to false (PR: #83958)
• Allow running DartLab as VS test gate (PR: #83690)
• Remove ExternalAccess.Razor and give Razor deeper IVT to Roslyn (PR: #83879)
• Remove catch from FBA fuzz test (PR: #83820)
• Move cohost handlers from ExternalAccess.Razor to Razor (PR: #83880)
• Empty and Remove ExternalAccess.Razor (PR: #83920)

[davidwengier]

I should have thought to do this 🤦‍♂️