cherry-pick: updating breathe because their history has been rewritten (cpp-netlib#847)

maingoh · deanberris · commit 604d61146d84 · 2018-06-14T14:19:59.000+10:00
diff --git a/libs/network/doc/_ext/breathe b/libs/network/doc/_ext/breathe
@@ -1 +1 @@
-Subproject commit a564b991b5eb2dc220ca29ef21b9c68bdc2f8ac6
+Subproject commit 65440b2673ebcc5c6ee2792b0b25754effba1183
