Bump ReportGenerator from 5.1.15 to 5.1.16

Bumps [ReportGenerator](https://github.com/danielpalme/ReportGenerator) from 5.1.15 to 5.1.16.
- [Release notes](https://github.com/danielpalme/ReportGenerator/releases)
- [Commits](danielpalme/ReportGenerator@v5.1.15...v5.1.16)

---
updated-dependencies:
- dependency-name: ReportGenerator
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/Polly.Specs/Polly.Specs.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="GitHubActionsTestLogger" Version="2.0.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
     <PackageReference Include="Moq" Version="4.18.4" />
-    <PackageReference Include="ReportGenerator" Version="5.1.15" PrivateAssets="all" />
+    <PackageReference Include="ReportGenerator" Version="5.1.16" PrivateAssets="all" />
     <PackageReference Include="xunit" Version="2.4.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" PrivateAssets="all" />
   </ItemGroup>