Bump Mono.TextTemplating.Roslyn from 2.2.1 to 3.0.0

Bumps [Mono.TextTemplating.Roslyn](https://github.com/mono/t4) from 2.2.1 to 3.0.0.
- [Release notes](https://github.com/mono/t4/releases)
- [Changelog](https://github.com/mono/t4/blob/main/release-steps.md)
- [Commits](mono/t4@v2.2.1...v3.0.0)

---
updated-dependencies:
- dependency-name: Mono.TextTemplating.Roslyn
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

T4.Build/T4.Build.csproj

@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Mono.TextTemplating.Roslyn" Version="2.2.1" />
+    <PackageReference Include="Mono.TextTemplating.Roslyn" Version="3.0.0" />
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta1.20574.7" />
   </ItemGroup>