Bump Reqnroll.CustomPlugin from 2.1.1 to 2.2.1

Bumps [Reqnroll.CustomPlugin](https://github.com/reqnroll/Reqnroll) from 2.1.1 to 2.2.1.
- [Release notes](https://github.com/reqnroll/Reqnroll/releases)
- [Changelog](https://github.com/reqnroll/Reqnroll/blob/main/CHANGELOG.md)
- [Commits](reqnroll/Reqnroll@v2.1.1...v2.2.1)

---
updated-dependencies:
- dependency-name: Reqnroll.CustomPlugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/xRetry.Reqnroll/xRetry.Reqnroll.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Reqnroll.CustomPlugin" Version="2.1.1" />
+    <PackageReference Include="Reqnroll.CustomPlugin" Version="2.2.1" />
   </ItemGroup>
 
   <ItemGroup>