chore(airflow): Update changelog for 26.3 (#1407)

Author: Techassi

CHANGELOG.md

@@ -6,6 +6,7 @@ All notable changes to this project will be documented in this file.
 
 ### Added
 
+- airflow: Add 3.1.5 ([#1405]).
 - superset: Add 6.0.0 ([#1337], [#1393]).
 - opa: Add 1.12.2 ([#1396]).
 - hive: Build [hive-metastore-opa-authorizer](https://github.com/boschglobal/hive-metastore-opa-authorizer) from source and add to image ([#1340]).
@@ -29,6 +30,7 @@ All notable changes to this project will be documented in this file.
 
 ### Removed
 
+- airflow: Remove 2.10.5 and 3.0.1 ([#1405]).
 - opensearch: Remove the `performance-analyzer` plugin from the OpenSearch image ([#1357]).
 - superset: Remove 4.0.2 and 4.1.2 ([#1394]).
 - kafka: Remove `3.7.2` and `4.1.0` ([#1395]).
@@ -62,6 +64,7 @@ All notable changes to this project will be documented in this file.
 [#1395]: https://github.com/stackabletech/docker-images/pull/1395
 [#1396]: https://github.com/stackabletech/docker-images/pull/1396
 [#1401]: https://github.com/stackabletech/docker-images/pull/1401
+[#1405]: https://github.com/stackabletech/docker-images/pull/1405
 
 ## [25.11.0] - 2025-11-07