v6.3.0-beta.3

See full changelog here.

Commits:

• agent: track queries (#1439)
• scripts/systemd: update services (#1440)
• agent: combine connection deletion events (#1442)
• build: fix postgres (#1444)
• smp server: use origin client version when processing proxied command, fixes old client sending to new server (#1443)
• docker: refactor (#1438)
• 6.3.0.3