(deps): Bump the microsoft group across 1 directory with 2 updates

Bumps the microsoft group with 2 updates in the /src directory: [Microsoft.Build](https://github.com/dotnet/msbuild) and [Microsoft.Build.Utilities.Core](https://github.com/dotnet/msbuild).


Updates `Microsoft.Build` from 17.11.4 to 17.12.6
- [Release notes](https://github.com/dotnet/msbuild/releases)
- [Changelog](https://github.com/dotnet/msbuild/blob/main/documentation/Changelog.md)
- [Commits](dotnet/msbuild@v17.11.4...v17.12.6)

Updates `Microsoft.Build.Utilities.Core` from 17.11.4 to 17.12.6
- [Release notes](https://github.com/dotnet/msbuild/releases)
- [Changelog](https://github.com/dotnet/msbuild/blob/main/documentation/Changelog.md)
- [Commits](dotnet/msbuild@v17.11.4...v17.12.6)

---
updated-dependencies:
- dependency-name: Microsoft.Build
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: microsoft
- dependency-name: Microsoft.Build.Utilities.Core
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: microsoft
...

Signed-off-by: dependabot[bot] <[email protected]>

src/Directory.Packages.props

@@ -23,8 +23,8 @@
     <PackageVersion Include="JunitXml.TestLogger" Version="4.1.0" />
     <PackageVersion Include="MSBuild.ProjectCreation" Version="13.0.0" />
     <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.Build" Version="17.11.4" />
-    <PackageVersion Include="Microsoft.Build.Utilities.Core" Version="17.11.4" />
+    <PackageVersion Include="Microsoft.Build" Version="17.12.6" />
+    <PackageVersion Include="Microsoft.Build.Utilities.Core" Version="17.12.6" />
     <PackageVersion Include="Microsoft.Extensions.Configuration.CommandLine" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.FileSystemGlobbing" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="8.0.1" />