app/matrix: bump synapse do 1.42.0, enable public room browsing

Change-Id: Idf5a2e7bdcff89c0093908b17afc455e2768694b
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1146
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/app/matrix/lib/matrix-ng.libsonnet b/app/matrix/lib/matrix-ng.libsonnet
index 5149539..1fc07e7 100644
--- a/app/matrix/lib/matrix-ng.libsonnet
+++ b/app/matrix/lib/matrix-ng.libsonnet
@@ -108,7 +108,7 @@
         storageClassName: "waw-hdd-redundant-3",
 
         images: {
-            synapse: "matrixdotorg/synapse:v1.37.1",
+            synapse: "matrixdotorg/synapse:v1.42.0",
             riot: "vectorim/element-web:v1.8.5",
             casProxy: "registry.k0.hswaw.net/q3k/oauth2-cas-proxy:0.1.4",
             appserviceIRC: "matrixdotorg/matrix-appservice-irc:release-v0.29.0",