fix: pin rdflib < 6.0.0 to avoid compatibility issues

--HG--
branch : 3.26

.gitlab-ci.yml

@@ -6,6 +6,7 @@ stages:
 lint_py:
   only:
     changes:
+      - "*.py"
       - "**/*.py"
   stage: lint
   before_script:

setup.py

@@ -107,7 +107,7 @@ setup(
             'repoze.lru',
         ],
         'rdf': [
-            'rdflib',
+            'rdflib >= 5.0.0, < 6.0.0',
         ],
         'sparql': [
             'fyzz >= 0.1.0',