Bump Microsoft.Build.Utilities.Core from 18.4.0 to 18.6.3

---
updated-dependencies:
- dependency-name: Microsoft.Build.Utilities.Core
  dependency-version: 18.6.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/dotnes.tasks/dotnes.tasks.csproj

@@ -16,7 +16,7 @@
     <Using Include="NES" />
     <InternalsVisibleTo Include="dotnes.tests" />
     <PackageReference Include="Microsoft.Build.Tasks.Core" Version="18.4.0" />
-    <PackageReference Include="Microsoft.Build.Utilities.Core" Version="18.4.0" />
+    <PackageReference Include="Microsoft.Build.Utilities.Core" Version="18.6.3" />
     <PackageReference Include="System.Reflection.Metadata" Version="10.0.8" />
     <None Update="Targets\*" CopyToOutputDirectory="PreserveNewest" TargetPath="%(FileName)%(Extension)" />
   </ItemGroup>