security(deps): pin zipp to 3.19.1 (#32)

Co-authored-by: snyk-io[bot] <141718529+snyk-io[bot]@users.noreply.github.com>

Author: snyk-io[bot]

requirements.txt

@@ -2,4 +2,5 @@ requests==2.28.2
 tox
 pytest
 python-dotenv
-flit
+flit
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability