chore(deps): update dependency stackexchange.redis to 2.12.8

Author: renovate[bot]

Directory.Packages.props

@@ -24,7 +24,7 @@
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="Npgsql" Version="10.0.2" />
     <PackageVersion Include="Shouldly" Version="4.3.0" />
-    <PackageVersion Include="StackExchange.Redis" Version="2.12.4" />
+    <PackageVersion Include="StackExchange.Redis" Version="2.12.8" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="ZooKeeperNetEx" Version="3.4.12.4" />