[library-web/oscp] Downgrade yelp-xsl

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 63887696fc967309f33764332b8cd01680cedc71
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Thu Feb 6 10:18:41 2020 +0100

    Downgrade yelp-xsl

 lgo/Dockerfile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/lgo/Dockerfile b/lgo/Dockerfile
index 7d2d7c3..b15f104 100644
--- a/lgo/Dockerfile
+++ b/lgo/Dockerfile
@@ -10,7 +10,8 @@ RUN git clone https://gitlab.gnome.org/Infrastructure/library-web.git /opt/lgo &
     cd /opt/lgo && ./autogen.sh && make -j2
 
 RUN git clone https://github.com/GNOME/yelp-xsl /opt/yelp-xsl && \
-    cd /opt/yelp-xsl && ./autogen.sh && make -j2
+    cd /opt/yelp-xsl && git checkout 536ef0406c97a4830442f0bd7d11b840b0a9df70 && \
+    ./autogen.sh && make -j2
 
 ADD library-web.lgorc developer.lgorc /opt/
 ADD release-notes-gen /usr/local/bin/release-notes-gen