Version 4.2.0

• New feature
  • Add pg_stat_statements.toplevel field (Marc Cousin, Julien Rouhaud)
• Bugfixes
  • Fix a possible long waiting time when the background worker is asleep and another session is waiting for a pending event, like a DROP DATABASE (Julien Rouhaud, thanks for github user anikin-aa for the report)
  • Fix pg_stat_kcache support when not all metrics are available (Julien Rouhaud)
• Misc
  • Add compatibility with postgres 16 (Julien Rouhaud)
  • Immediately exit the bgworker in binary upgrade mode, which could lead to data corruption in the powa database (Julien Rouhaud)