#548: Replaced pytest-exasol-itde with pytest-backend (#549)

* Tighten the assert in test_regression_bug390.py to react on Exceptions
* Add explanation for changed assert in test_regression_bug390.py

Author: tkilias

doc/changes/unreleased.md

@@ -2,4 +2,9 @@
 
 ## 🔧 Changed
 
-- #558 Updated to poetry 2.1.2 & relocked dependencies to resolve CVE-2025-27516
+- #558 Updated to poetry 2.1.2 & relocked dependencies to resolve CVE-2025-27516
+
+## 🧰 Internal
+
+- #548: Replaced pytest-exasol-itde with pytest-backend
+