🔧(backend) update pdbpp for tab autocompletion in tests

The latest release of the package `fancycompleter` was causing our CircleCi
task to run unit test to fail.

Author: wilbrdt

src/backend/setup.cfg

@@ -99,7 +99,7 @@ dev =
     flake8==7.1.1
     ipython==8.31.0
     isort==5.13.2
-    pdbpp==0.10.3
+    pdbpp==0.11.5
     pycodestyle==2.12.1
     pylint-django==2.6.1
     pylint-plugin-utils==0.8.2