tools: toolchain: update to Fedora 31

This is a minor update as gcc and boost versions do not change.

glibc-langpack-en no longer gets pulled in by default. As it is required
by some locale use somewhere, it is added to the explicit dependencies.

install-dependencies.sh

@@ -75,6 +75,7 @@ fedora_packages=(
     util-linux
     ethtool
     hwloc
+    glibc-langpack-en
 )
 
 centos_packages=(

tools/toolchain/Dockerfile

@@ -1,4 +1,4 @@
-FROM fedora:30
+FROM fedora:31
 ADD ./install-dependencies.sh ./
 ADD ./seastar/install-dependencies.sh ./seastar/
 ADD ./tools/toolchain/system-auth ./

tools/toolchain/image

@@ -1 +1 @@
-docker.io/scylladb/scylla-toolchain:fedora-30-20191022
+docker.io/scylladb/scylla-toolchain:fedora-31-20191119