Bump Microsoft.SourceLink.GitHub from 10.0.203 to 10.0.300

---
updated-dependencies:
- dependency-name: Microsoft.SourceLink.GitHub
  dependency-version: 10.0.300
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -16,7 +16,7 @@
   </ItemGroup>
   <!-- SourceLink -->
   <ItemGroup>
-    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.203" />
+    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.300" />
   </ItemGroup>
   <!-- Sample dependencies -->
   <ItemGroup>