[release/dev18.3] Source code updates from dotnet/dotnet (#12710)

> [!NOTE]
> This is a codeflow update. It may contain both source code changes
from
> [the VMR](https://github.com/dotnet/dotnet)
> as well as dependency updates. Learn more
[here](https://github.com/dotnet/dotnet/tree/main/docs/Codeflow-PRs.md).

This pull request brings the following source code changes

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## From https://github.com/dotnet/dotnet
- **Subscription**:
[9c8b4cab-99fe-4111-a1bf-402c69dd846e](https://maestro.dot.net/subscriptions?search=9c8b4cab-99fe-4111-a1bf-402c69dd846e)
- **Build**:
[20260122.16](https://dev.azure.com/dnceng/internal/_build/results?buildId=2885360)
([298481](https://maestro.dot.net/channel/8856/github:dotnet:dotnet/build/298481))
- **Date Produced**: January 22, 2026 8:28:51 PM UTC
- **Commit**:
[b68c335619ddcdd7d10b40d49f9e6dfa97e710e5](dotnet/dotnet@b68c335)
- **Commit Diff**:
[cbfb8ee...b68c335](dotnet/dotnet@cbfb8ee...b68c335)
- **Branch**:
[release/10.0.2xx](https://github.com/dotnet/dotnet/tree/release/10.0.2xx)

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## Associated changes in source repos
-
dotnet/fsharp@5d23fef...fd9ac34
-
dotnet/msbuild@6ef3f7b...0a54973
-
a8b3ccb...191feab
-
dotnet/roslyn@adb4347...9147db3
-
dotnet/sdk@55c2d87...275e4bf
-
dotnet/source-build-assets@3397ffb...ad86fd7
-
dotnet/sourcelink@494565b...b938629
-
dotnet/templating@2d85261...ce3a238

<details>
<summary>Diff the source with this PR branch</summary>

```bash
darc vmr diff --name-only https://github.com/dotnet/dotnet:b68c335619ddcdd7d10b40d49f9e6dfa97e710e5..https://github.com/dotnet/razor:darc-release/dev18.3-e713a5d6-c7d3-479c-b5f3-9a4ea25282a9
```
</details>

[marker]: <> (End:Footer:CodeFlow PR)

Author: davidwengier

eng/Version.Details.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
-  <Source Uri="https://github.com/dotnet/dotnet" Mapping="razor" Sha="cbfb8ee940d9d2458c24214a976305d5f1c5fe32" BarId="297285" />
+  <Source Uri="https://github.com/dotnet/dotnet" Mapping="razor" Sha="b68c335619ddcdd7d10b40d49f9e6dfa97e710e5" BarId="298481" />
   <ProductDependencies>
     <Dependency Name="Roslyn.Diagnostics.Analyzers" Version="5.3.0-2.26064.108">
       <Uri>https://github.com/dotnet/dotnet</Uri>