redhat_manifest: drop Ansible pre 2.9 special casing

plugins/modules/redhat_manifest.py

@@ -154,16 +154,7 @@ def fetch_portal(module, path, method, data=None, accept_header='application/jso
     fetch_kwargs = {'timeout': 30}
     if os.path.exists(REDHAT_UEP):
         fetch_kwargs['ca_path'] = REDHAT_UEP
-    try:
-        resp, info = fetch_url(module, url, data, headers, method, **fetch_kwargs)
-    except TypeError:
-        # ca_path was added in Ansible 2.9 and backported to 2.8 in 2.8.6
-        # older Ansible releases don't support that and we have to omit the CA cert here
-        if module.params['validate_certs']:
-            module.warn("Your Ansible version does not support providing custom CA certificates for HTTP requests. "
-                        "Talking to the Red Hat portal might fail without validate_certs=False. Please update.")
-        del fetch_kwargs['ca_path']
-        resp, info = fetch_url(module, url, data, headers, method, **fetch_kwargs)
+    resp, info = fetch_url(module, url, data, headers, method, **fetch_kwargs)
     if resp is None or info["status"] >= 400:
         try:
             error = json.loads(info['body'])['displayMessage']