Make cloudfront_info work with Python3 … (#66695)

* Make cloudfront_info work with Python3 by using dict.update(dict) instead of dict += dict.

* Added changelog fragment for cloudfront_info fix

changelogs/fragments/66695-cloudfront-info-python3-fix.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - Make cloudfront_info module work with Python 3

lib/ansible/modules/cloud/amazon/cloudfront_info.py

@@ -504,7 +504,7 @@ class CloudFrontServiceManager:
         try:
             distribution_id = ""
             distributions = self.list_distributions(False)
-            distributions += self.list_streaming_distributions(False)
+            distributions.update(self.list_streaming_distributions(False))
             for dist in distributions:
                 if 'Items' in dist['Aliases']:
                     for alias in dist['Aliases']['Items']: