Merge pull request #207 from palfrey/renovate/packaging-26.x

Update dependency packaging to v26

Author: renovate[bot]

requirements.txt

@@ -101,7 +101,7 @@ outcome==1.3.0.post0
     # via
     #   trio
     #   trio-websocket
-packaging==25.0
+packaging==26.0
     # via
     #   -r requirements.in
     #   pytest