swh-deposit-checkers-20230523.2: Build image with frozen set requirements

apps/swh-deposit-checkers/requirements-frozen.txt

@@ -49,6 +49,7 @@ pycparser==2.21
 pytest==7.3.1
 pytest-postgresql==3.1.3
 python-dateutil==2.8.2
+python-json-logger==2.0.7
 python-magic==0.4.27
 python-mimeparse==1.6.0
 pytz==2023.3