Update mautrix-go to fix potential concurrent map writes

go.mod

@@ -13,7 +13,7 @@ require (
 	gopkg.in/yaml.v2 v2.3.0
 	maunium.net/go/mauflag v1.0.0
 	maunium.net/go/maulogger/v2 v2.2.3
-	maunium.net/go/mautrix v0.8.4
+	maunium.net/go/mautrix v0.8.5
 )
 
 replace github.com/Rhymen/go-whatsapp => github.com/tulir/go-whatsapp v0.4.0-rc.2.0.20210225152147-6bc95e2c807b

go.sum

@@ -480,5 +480,7 @@ maunium.net/go/mautrix v0.8.3 h1:nKGdARVCf2w7thEN5GEbAjYrlLjKLX44jOdB1h+BV7U=
 maunium.net/go/mautrix v0.8.3/go.mod h1:LPbb/DeAmtOPKnGbJazL9g11cO3mMAaEbLE8udd98BU=
 maunium.net/go/mautrix v0.8.4 h1:+X1DLAc+uSq3B9Si/3mG43GtXnw4iPoPN83P1u/tbco=
 maunium.net/go/mautrix v0.8.4/go.mod h1:W3yDq9H5qSqo14Gu6rWF9uE5NXLIcmqF7oY0pv5lZs8=
+maunium.net/go/mautrix v0.8.5 h1:GNW8mde745M6H54Bpw9TJBAgME+iphS0kGvO+Vx1J0Q=
+maunium.net/go/mautrix v0.8.5/go.mod h1:W3yDq9H5qSqo14Gu6rWF9uE5NXLIcmqF7oY0pv5lZs8=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=