investigate why sqlserver tests only work on ubuntu 20

[pjfanning]

• tried to upgrade the CI job in use ubuntu 22 in CI #277
• sqlserver tests failed so I left them on ubuntu 20
• unfortunately GitHub is removing ubuntu 20 support so we can't stay indefinitely on ubuntu 20

https://github.com/apache/pekko-persistence-jdbc/actions/runs/13979876847

with ubuntu 22, we can't connect

[info] SqlServerSnapshotStoreSpec:
2025-03-20 23:24:19,466 - org.apache.pekko.event.slf4j.Slf4jLogger -> INFO [SnapshotStoreSpec-pekko.actor.default-dispatcher-5] [  Slf4jLogger - Slf4jLogger started
Mar 20, 2025 11:24:20 PM com.microsoft.sqlserver.jdbc.SQLServerConnection prelogin
WARNING: ConnectionID:1 ClientConnectionId: c8cd244f-ea98-4e47-9ef3-8230d0722f48 Prelogin error: host localhost port 1433 Unexpected end of prelogin response after 0 bytes read
Mar 20, [202](https://github.com/apache/pekko-persistence-jdbc/actions/runs/13979876847/job/39146758578#step:7:203)5 11:24:20 PM com.microsoft.sqlserver.jdbc.SQLServerConnection prelogin
WARNING: ConnectionID:1 ClientConnectionId: f3f57220-463e-4cd8-b81e-1dab51dad0b1 Prelogin error: host localhost port 1433 Unexpected end of prelogin response after 0 bytes read
Mar 20, 2025 11:24:20 PM com.microsoft.sqlserver.jdbc.SQLServerConnection prelogin
WARNING: ConnectionID:2 ClientConnectionId: b4fc7a27-b30c-4530-aece-b5bc0a118a01 Prelogin error: host localhost port 1433 Unexpected end of prelogin response after 0 bytes read