Add GlobalSign root to the CA bundle

Fixes mongoose-os-libs/gcp#1

PUBLISHED_FROM=a80ad872a50f240ce7a390ba382d073778560609

fs/ca.pem

@@ -243,3 +243,29 @@ iEDPfUYd/x7H4c7/I9vG+o1VTqkC50cRRj70/b17KSa7qWFiNyi2LSr2EIZkyXCn
 0q23KXB56jzaYyWf/Wi3MOxw+3WKt21gZ7IeyLnp2KhvAotnDU0mV3HaIPzBSlCN
 sSi6
 -----END CERTIFICATE-----
+
+Subject: OU=GlobalSign Root CA - R2, O=GlobalSign, CN=GlobalSign
+Not Before: Dec 15 08:00:00 2006 GMT
+Not After : Dec 15 08:00:00 2021 GMT
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----