Include context for postgis usage in the changelog.

Author: tim-schilling

docs/changes.rst

@@ -13,8 +13,7 @@ Pending
   class instance, regardless if any data was generated.
 * Fixed selenium tests for CI by using psycopg for Python 3.13 runs.
 * Added ``CommunityPanel`` containing links to documentation and resources.
-* Upgraded ``postigs`` from ``postgis:14-3.1`` to ``postgis:17-3.5``.
-
+* Upgraded CI ``postgis`` version 17-3.5.
 * Added how to generate the documentation locally to the contributing
   documentation.