Update dependency Polly to 8.6.4

Author: renovate[bot]

src/Signhost.APIClient/Signhost.APIClient.csproj

@@ -43,7 +43,7 @@
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 		</PackageReference>
-		<PackageReference Include="Polly" Version="8.6.3" />
+		<PackageReference Include="Polly" Version="8.6.4" />
 		<PackageReference Include="EntrustSignhostClientLibrary" Version="4.2.1" />
 	</ItemGroup>
 </Project>