build(deps): bump Microsoft.Extensions.Caching.Abstractions

Bumps [Microsoft.Extensions.Caching.Abstractions](https://github.com/dotnet/runtime) from 7.0.0 to 8.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v7.0.0...v8.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Caching.Abstractions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Pomelo.Extensions.Caching.MySql/Pomelo.Extensions.Caching.MySql.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <Description>Distributed cache implementation of Microsoft.Extensions.Caching.Distributed.IDistributedCache using MySql.</Description>
@@ -23,7 +23,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="7.0.1" />
     <PackageReference Include="MySqlConnector" Version="2.2.5" />
   </ItemGroup>