chore: dependencies upgrade

[NatMarchand]

Hey there! I've made a PR to upgrade dependencies mainly to switch to Microsoft.Data.SqlClient (solves #193) and took the opportunity to upgrade other dependencies. Among other stuffs I've also used centralized nuget packages versions. Please note that, although I've made my best to be non breaking, in order to do this I've changed the required framework version from net461 to net462 and removed the target net461 from aspnetcore projet (as aspnetcore on net framework has not been supported for a long time). I've thought about supporting Microsoft.Data.SqlClient and System.Data.SqlClient side by side by moving the mssql store to another assembly and using reflection for catching SqlException (like it's done for the redis exception) but I'm afraid of the perf penalty which could occur. I'd be happy to talk to you if you need :)