Add 2.22 to support matrix (#4399)

Author: philkra

_partials/_migrate_self_postgres_timescaledb_compatibility.md

@@ -1,6 +1,7 @@
 
 | $TIMESCALE_DB version |$PG 17|$PG 16|$PG 15|$PG 14|$PG 13|$PG 12|$PG 11|$PG 10|
 |-----------------------|-|-|-|-|-|-|-|-|
+| 2.22.x                |✅|✅|✅|❌|❌|❌|❌|❌|❌|
 | 2.21.x                |✅|✅|✅|❌|❌|❌|❌|❌|❌|
 | 2.20.x                |✅|✅|✅|❌|❌|❌|❌|❌|❌|
 | 2.17 - 2.19           |✅|✅|✅|✅|❌|❌|❌|❌|❌|