Merge branch '683-postgres-9-6-eol' into 'master'

chore: drop PostgreSQL 9.6 support (EOL since Nov 2021)

Closes #683

See merge request postgres-ai/database-lab!1115

Author: agneum

README.md

@@ -92,7 +92,7 @@ Read more:
     - Theoretical max of snapshots/clones: 2<sup>64</sup> ([ZFS](https://en.wikipedia.org/wiki/ZFS), default)
     - Maximum size of PostgreSQL data directory: 256 quadrillion zebibytes, or 2<sup>128</sup> bytes ([ZFS](https://en.wikipedia.org/wiki/ZFS), default)
 - Support & technologies
-    - Supported PostgreSQL versions: 9.6–18
+    - Supported PostgreSQL versions: 10–18
     - Thin cloning ([CoW](https://en.wikipedia.org/wiki/Copy-on-write)) technologies: [ZFS](https://en.wikipedia.org/wiki/ZFS) and [LVM](https://en.wikipedia.org/wiki/Logical_Volume_Manager_(Linux))
     - UI for manual tasks and API & CLI for automation
     - Packaged in Docker containers for all components

engine/.gitlab-ci.yml

@@ -572,11 +572,6 @@ bash-test-18:
     POSTGRES_VERSION: 18
 
 # Main branch jobs - full matrix (all PostgreSQL versions)
-bash-test-main-9-6:
-  <<: *bash_test_main
-  variables:
-    POSTGRES_VERSION: "9.6"
-
 bash-test-main-10:
   <<: *bash_test_main
   variables: