fix: Install libclntsh.so (RHEL), update EPEL RPM (AL2) (fixes #27)

tasks/oci8-RedHat.yml

 ---
 - name: Install OCI8 extension
   ansible.builtin.package:
-    name: "{{ php_package_prefix }}-oci8"
+    name:
+      - "https://download.oracle.com/otn_software/linux/instantclient/oracle-instantclient-basic-linuxx64.rpm"
+      - "{{ php_package_prefix }}-oci8"
     state: present
   when: ansible_distribution != 'Amazon'
   become: true

vars/Amazon.yml

 ---
 php_distribution_major_version: 7
 php_enabled_yum_repos:
-  - https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
+  - https://dl.fedoraproject.org/pub/archive/epel/7/x86_64/Packages/e/epel-release-7-14.noarch.rpm
   - https://rpms.remirepo.net/enterprise/remi-release-7.rpm
 php_imported_gpg_keys:
   - https://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-7