Bump Polly.Core from 8.6.5 to 8.6.6 (#240)

---
updated-dependencies:
- dependency-name: Polly.Core
  dependency-version: 8.6.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

src/Tingle.PeriodicTasks/Tingle.PeriodicTasks.csproj

@@ -16,7 +16,7 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.7" />
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="10.0.7" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="10.0.7" />
-    <PackageReference Include="Polly.Core" Version="8.6.5" />
+    <PackageReference Include="Polly.Core" Version="8.6.6" />
   </ItemGroup>
 
 </Project>