Bump riot-web on matrix.hackerspace.pl

Change-Id: Ia043a03afb85b1a149b112a2be5c29fb26d5969d
diff --git a/app/matrix/lib/matrix.libsonnet b/app/matrix/lib/matrix.libsonnet
index 5f9ecd2..7b10f6f 100644
--- a/app/matrix/lib/matrix.libsonnet
+++ b/app/matrix/lib/matrix.libsonnet
@@ -44,7 +44,7 @@
 
         images: {
             synapse: "matrixdotorg/synapse:v1.19.2",
-            riot: "vectorim/riot-web:v1.7.7",
+            riot: "vectorim/riot-web:v1.7.16",
             casProxy: "registry.k0.hswaw.net/q3k/oauth2-cas-proxy:0.1.4",
             appserviceIRC: "matrixdotorg/matrix-appservice-irc:release-0.17.1",
             # That's v0.8.2 - we just don't trust that host to not re-tag images.