app/matrix: bump synapse, riot-web

This has already been bumped in production, and this change makes it
reflect that.

This was supposed to fix iOS sign-in, but that didn't seem to have
worked.

Change-Id: I9278490e40b332a8439fdf1361f27df770b8cd9e

app/matrix/prod.jsonnet

@@ -16,8 +16,8 @@ local postgres = import "../../kube/postgres.libsonnet";
         serverName: "hackerspace.pl",
         storageClassName: "waw-hdd-paranoid-2",
 
-        synapseImage: "matrixdotorg/synapse:v1.11.1",
-        riotImage: "vectorim/riot-web:v1.5.13",
+        synapseImage: "matrixdotorg/synapse:v1.17.0",
+        riotImage: "vectorim/riot-web:v1.7.1",
         casProxyImage: "registry.k0.hswaw.net/q3k/oauth2-cas-proxy:0.1.4",
         appserviceIRCImage: "matrixdotorg/matrix-appservice-irc:release-0.17.1",
     },