Bump Npgsql/EF Core to 6.0.0-preview3

[roji]

Since EF Core 6.0.0-preview3 contains the stronger reflection fix (dotnet/efcore#24090), this should make our dashboard work again.

This should start showing the perf improvements from dotnet/efcore#23611.

/cc @ajcvickers

[sebastienros]

I tried to run it and it didn't work, the packages are not available on our feeds I assume

crank --config https://raw.githubusercontent.com/aspnet/Benchmarks/main/scenarios/database.benchmarks.yml --scenario fortunes_ef --profile aspnet-perf-lin --application.source.branchOrCommit EFPreview3 --application.source.repository https://github.com/roji/AspNetBenchmarks --application.framework net6.0

/tmp/benchmarks-agent/benchmarks-server-1/1rm1kp1o.2d1/AspNetBenchmarks/src/Benchmarks/Benchmarks.csproj : error NU1102: Unable to find package Npgsql.EntityFrameworkCore.PostgreSQL with version (>= 6.0.0-preview3)
/tmp/benchmarks-agent/benchmarks-server-1/1rm1kp1o.2d1/AspNetBenchmarks/src/Benchmarks/Benchmarks.csproj : error NU1102:   - Found 60 version(s) in dotnet-public [ Nearest version: 6.0.0-preview2 ]

[sebastienros]

@wtgodbe can you add Npgsql and EF.SQlserver preview3 on the feeds please?

[wtgodbe]

@wtgodbe can you add Npgsql and EF.SQlserver preview3 on the feeds please?

Done

[sebastienros]

It worked, thanks