Update Pulp to 3.45 in integration tests

One of the tests failed:

  Cannot open
  /var/lib/pulp/tmp/472@6a279c28a9a3/tmpx7xo368b/tmp0450y_ow-3a0f555ea0e559e403fd0273f0cc10d7ba533c1c8a86d17ab4aa9297c186da78-updateinfo.xml.zst:
  Cannot detect compression type)

Author: markgoddard

tests/pulp-in-one.sh

@@ -8,7 +8,7 @@ set -o pipefail
 
 mkdir -p settings
 
-PULP_TAG=${PULP_TAG:-"3.21"}
+PULP_TAG=${PULP_TAG:-"3.45"}
 
 cat << EOF > settings/settings.py
 CONTENT_ORIGIN='http://$(hostname):8080'