chore(deps): pin importlib-metadata (#7927)

requirements.txt

@@ -33,6 +33,7 @@ gunicorn>=20.1.0
 hashids>=1.3.1
 html2text>=2020.1.16    # Used only to clean comment field of secr/sreq
 html5lib>=1.1    # Only used in tests
+importlib-metadata<8.5.0  # indirect req of Markdown/inflect; https://github.com/ietf-tools/datatracker/issues/7924
 inflect>= 6.0.2
 jsonfield>=3.1.0    # for SubmissionCheck.  This is https://github.com/bradjasper/django-jsonfield/.
 jsonschema[format]>=4.2.1