Ubuntu 19.04 -> 19.10 (#5475)

frameworks/PHP/symfony/symfony-raw.dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:19.04
+FROM ubuntu:19.10
 
 ARG DEBIAN_FRONTEND=noninteractive
 

frameworks/PHP/symfony/symfony.dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:19.04
+FROM ubuntu:19.10
 
 ARG DEBIAN_FRONTEND=noninteractive