[discourse-web] Update postgresql-client to 12

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit e42dce879ea55e199e1186023549d21f7d54a7f1
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Tue Mar 3 11:24:04 2020 +0100

    Update postgresql-client to 12

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index 338379b..a620813 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,7 +12,7 @@ RUN apt update && \
     apt-get update && apt-get -y upgrade && \
     apt-get -y install build-essential gettext \
     # Install postgres
-    postgresql-client-10 \
+    postgresql-client-12 \
     # Install image utilities
     advancecomp jpegoptim gifsicle libjpeg-turbo-progs libpng-dev optipng pngcrush pngquant jhead gsfonts \
     # Install nodejs and yarn