build: Bump Polly from 7.2.3 to 8.6.4

---
updated-dependencies:
- dependency-name: Polly
  dependency-version: 8.6.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

APIMatic.Core/APIMatic.Core.csproj

@@ -34,7 +34,7 @@
         <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
         <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.1" />
         <PackageReference Include="Microsoft.Json.Pointer" Version="2.3.0" />
-        <PackageReference Include="Polly" Version="7.2.3" />
+        <PackageReference Include="Polly" Version="8.6.4" />
         <PackageReference Include="PolySharp" Version="1.15.0">
           <PrivateAssets>all</PrivateAssets>
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>