[etherpad-web/oscp-backend] Update etherpad to the 1.7.5 release

[Andrea Veri <averi src gnome org>]

commit e7be4d9a0bd8876729863ea3318e9668f4b1b1de
Author: Andrea Veri <av gnome org>
Date:   Tue Jul 16 10:33:51 2019 +0000

    Update etherpad to the 1.7.5 release

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index fafcf31..5920c9f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM centos:7
 MAINTAINER Wolfgang Kulhanek <WolfgangKulhanek gmail com>
-ARG ETHERPAD_VERSION="1.7.0"
+ARG ETHERPAD_VERSION="1.7.5"
 
 LABEL name="Etherpad Lite" \
       io.k8s.display-name="Etherpad Lite" \