Fix the EL python version.

tasks/py3_el.yml

@@ -1,7 +1,7 @@
 ---
 - block:
   - name: Install the python3 EL packages
-    yum: name={{ py3_env_dpkg }} state={{ py3_env_pkgs_state }}
+    yum: name={{ py3_el_env_dpkg }} state={{ py3_env_pkgs_state }}
 
 #  - name: Install the correct pip3 version
 #    shell: python{{ py3_env_version }} -m ensurepip && pip{{ py3_env_version }} install --upgrade pip setuptools wheel