Improve pip-tools installation in update CI

Author: electrocucaracha

.github/workflows/update.yml

@@ -57,8 +57,13 @@ jobs:
                   INSTALLER_CMD="$(command -v dnf || command -v yum) -y --quiet --errorlevel=0 install"
               ;;
           esac
-          $INSTALLER_CMD python3-pip git
-          pip3 install pip-tools
+          $INSTALLER_CMD git
+      - uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # 5.3.0
+        with:
+          python-version: "3.9.21" # NOTE: https://www.python.org/downloads/ https://docs.openstack.org/tempest/latest/supported_version.html#supported-python-versions
+      - uses: insightsengineering/pip-action@9252b12ade07a9e628ab42b90565beaa56e8b85c # 2.0.1
+        with:
+          packages: pip-tools
       - uses: technote-space/create-pr-action@91114507cf92349bec0a9a501c2edf1635427bc5 # 2.1.4
         with:
           EXECUTE_COMMANDS: |