Use new stable frontend release

Dockerfile

@@ -12,13 +12,11 @@ RUN apt-get update && apt-get install -y \
     libxml2-dev libxslt-dev \
     && rm -rf /var/cache/apt /var/lib/apt/lists /etc/ssh_host_*
 
-# We don't use release tags but the stable branches
-
 ## backend (https://github.com/taigaio/taiga-back/commits/stable)
-RUN curl -L https://github.com/taigaio/taiga-back/archive/34fbb01fe0dac0f05f884891d43f1cb48f2c1a75.tar.gz | tar -xz -C /app/code/taiga-back --strip-components 1 -f -
+RUN curl -L https://github.com/taigaio/taiga-back/archive/3.1.3.tar.gz | tar -xz -C /app/code/taiga-back --strip-components 1 -f -
 
 ## frontend (https://github.com/taigaio/taiga-front-dist/commits/stable)
-RUN curl -L https://github.com/taigaio/taiga-front-dist/archive/ac88fa2f9127c26173c2dd04e59dd076a3899ab9.tar.gz | tar -xz -C /app/code/taiga-front-dist --strip-components 1 -f -
+RUN curl -L https://github.com/taigaio/taiga-front-dist/archive/3.1.3-stable.tar.gz | tar -xz -C /app/code/taiga-front-dist --strip-components 1 -f -
 
 ADD build.sh nginx.conf conf.json conf_ldap.json local.py local_ldap.py start.sh /app/code/