Bump Microsoft.SourceLink.GitHub from 1.1.1 to 8.0.0

---
updated-dependencies:
- dependency-name: Microsoft.SourceLink.GitHub
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

wpfui/src/Packages.props

@@ -6,7 +6,7 @@
     <PackageReference Update="System.Drawing.Common" Version="6.0.0" />
     <PackageReference Update="System.ValueTuple" Version="4.5.0" />
     <PackageReference Update="NativeMethods" Version="0.0.3" />
-    <PackageReference Update="Microsoft.SourceLink.GitHub" Version="1.1.1" />
+    <PackageReference Update="Microsoft.SourceLink.GitHub" Version="8.0.0" />
     <PackageReference Update="Microsoft.VisualStudio.CoreUtility" Version="17.2.3194" />
   </ItemGroup>
 </Project>