Bump StackExchange.Redis from 2.6.66 to 2.6.70 (#1493)

Bumps [StackExchange.Redis](https://github.com/StackExchange/StackExchange.Redis) from 2.6.66 to 2.6.70.
- [Release notes](https://github.com/StackExchange/StackExchange.Redis/releases)
- [Changelog](https://github.com/StackExchange/StackExchange.Redis/blob/main/docs/ReleaseNotes.md)
- [Commits](StackExchange/StackExchange.Redis@2.6.66...2.6.70)

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

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src/HealthChecks.Redis/HealthChecks.Redis.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="StackExchange.Redis" Version="2.6.66" />
+    <PackageReference Include="StackExchange.Redis" Version="2.6.70" />
     <PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks" Version="6.0.10" />
   </ItemGroup>