Bump Rocket.Surgery.MSBuild.SourceLink from 1.1.0 to 1.2.1

---
updated-dependencies:
- dependency-name: Rocket.Surgery.MSBuild.SourceLink
  dependency-version: 1.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Packages.props

@@ -8,7 +8,7 @@
     <GlobalPackageReference Include="Rocket.Surgery.MSBuild.GitVersion" Version="1.1.0" />
     <GlobalPackageReference Include="Rocket.Surgery.MSBuild.JetBrains.Annotations" Version="1.1.0" Condition="'$(MSBuildProjectName)'!='.build'" />
     <GlobalPackageReference Include="Rocket.Surgery.MSBuild.Metadata" Version="1.1.0" />
-    <GlobalPackageReference Include="Rocket.Surgery.MSBuild.SourceLink" Version="1.1.0" />
+    <GlobalPackageReference Include="Rocket.Surgery.MSBuild.SourceLink" Version="1.2.1" />
     <GlobalPackageReference Include="Roslynator.Analyzers" Version="3.1.0" />
   </ItemGroup>
   <ItemGroup>