CI: add pip install in upgrade job

This will avoid check ansible version failed in upgrade job.

Signed-off-by: ChengHao Yang <17496418+tico88612@users.noreply.github.com>

tests/scripts/testcases_run.sh

@@ -18,6 +18,7 @@ if [ "${UPGRADE_TEST}" != "false" ]; then
   # Checkout the current tests/ directory ; even when testing old version,
   # we want the up-to-date test setup/provisionning
   git checkout "${CI_COMMIT_SHA}" -- tests/
+  pip install --no-compile --no-cache-dir -r requirements.txt
 fi
 
 export ANSIBLE_BECOME=true
@@ -80,6 +81,8 @@ run_playbook cluster.yml
 if [ "${UPGRADE_TEST}" != "false" ]; then
   git checkout "${CI_COMMIT_SHA}"
 
+  pip install --no-compile --no-cache-dir -r requirements.txt
+
   case "${UPGRADE_TEST}" in
     "basic")
         run_playbook cluster.yml