Merge pull request #2061 from CentreForDigitalHumanities/dependabot/pip/backend/pytest-9.0.3

Bump pytest from 8.4.2 to 9.0.3 in /backend

Author: lukavdplas

backend/requirements.txt

@@ -174,7 +174,7 @@ pyreadr==0.5.4
     # via -r requirements.in
 pysaml2==7.5.2
     # via djangosaml2
-pytest==8.4.2
+pytest==9.0.3
     # via
     #   -r requirements.in
     #   pytest-django