Include legacy AWS S3 CA in the bundle

It seems the rules for what AWS keep changing, so best to keep all
of the CAs in the bundle.

Author: Jonathan S. Katz

installers/ansible/roles/pgo-operator/files/pgo-backrest-repo/aws-s3-ca.crt

@@ -1,4 +1,25 @@
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+-----BEGIN CERTIFICATE-----
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