Merged PR 18342: [internal/release/3.1] Update dependencies from dnceng/internal/dotnet-aspnetcore-tooling

This pull request updates the following dependencies

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## From https://dev.azure.com/dnceng/internal/_git/dotnet-aspnetcore-tooling
- **Subscription**: 7bf32a0c-3505-43af-42b0-08d79559e63d
- **Build**: 20210922.3
- **Date Produced**: September 22, 2021 7:11:01 PM UTC
- **Commit**: 048f8096e118044a41f15178e5e41242f7b0f2dc
- **Branch**: refs/heads/internal/release/3.1

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- **Updates**:
  - **Microsoft.AspNetCore.Razor.Language**: [from 3.1.20 to 3.1.20][1]
  - **Microsoft.CodeAnalysis.Razor**: [from 3.1.20 to 3.1.20][1]
  - **Microsoft.NET.Sdk.Razor**: [from 3.1.20 to 3.1.20][1]
  - **Microsoft.AspNetCore.Mvc.Razor.Extensions**: [from 3.1.20 to 3.1.20][1]

[1]: https://dev.azure.com/dnceng/internal/_git/dotnet-aspnetcore-tooling/branches?baseVersion=GC1a667ca&targetVersion=GC048f809&_a=files

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Author: dotnet-bot