Remove packaging dependency

Once https://gerrit.openbmc.org/c/openbmc/bmcweb/+/59633 merges, we will
no longer need packaging as a dependecy.  Remove it.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ibd75ba7290a4dbd32fe0dddbb6d47ecef78ca7c6
diff --git a/scripts/build-unit-test-docker b/scripts/build-unit-test-docker
index c42dc50..1a957d4 100755
--- a/scripts/build-unit-test-docker
+++ b/scripts/build-unit-test-docker
@@ -852,7 +852,6 @@
 RUN pip3 install inflection
 RUN pip3 install jsonschema
 RUN pip3 install meson==0.63.0
-RUN pip3 install packaging
 RUN pip3 install protobuf
 RUN pip3 install pycodestyle
 RUN pip3 install requests