test/py/requirements.txt: Update packaging requirement

Update packaging to be version 23.2 to match our Sphinx requirements.
This will let us build a pip cache out of both of our requirements.txt
files.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/test/py/requirements.txt b/test/py/requirements.txt
index 07348b6..c3cc916 100644
--- a/test/py/requirements.txt
+++ b/test/py/requirements.txt
@@ -8,7 +8,7 @@
 importlib-metadata==0.23
 linecache2==1.0.0
 more-itertools==7.2.0
-packaging==21.3
+packaging==23.2
 pbr==5.4.3
 pluggy==0.13.0
 py==1.10.0