install python3-packaging in the Debian package build env (#1707)

Author: rcsanchez97

.evergreen/scripts/debian_package_build.sh

@@ -50,7 +50,7 @@ export DEBOOTSTRAP_DIR=`pwd`/debootstrap.git
 sudo -E ./debootstrap.git/debootstrap --variant=buildd unstable ./unstable-chroot/ http://cdn-aws.deb.debian.org/debian
 cp -a mongoc ./unstable-chroot/tmp/
 sudo chroot ./unstable-chroot /bin/bash -c '(\
-  apt-get install -y build-essential git-buildpackage fakeroot dpkg-dev debhelper cmake libssl-dev pkgconf python3-sphinx python3-sphinx-design furo libmongocrypt-dev zlib1g-dev libsasl2-dev libsnappy-dev libutf8proc-dev libzstd-dev libjs-mathjax && \
+  apt-get install -y build-essential git-buildpackage fakeroot dpkg-dev debhelper cmake libssl-dev pkgconf python3-sphinx python3-sphinx-design furo libmongocrypt-dev zlib1g-dev libsasl2-dev libsnappy-dev libutf8proc-dev libzstd-dev libjs-mathjax python3-packaging && \
   chown -R root:root /tmp/mongoc && \
   cd /tmp/mongoc && \
   git clean -fdx && \