Update dependency packaging to v26.1 (#3109)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

requirements-test.txt

@@ -19,4 +19,4 @@ treelite==4.7.0
 array-api-compat==1.14.0
 array-api-strict==2.5
 polars==1.39.3
-packaging==26.0
+packaging==26.1