[nfs] Update comment on lmod issue (will be fixed in debian 10.7)

steps/data/setup/puppet/modules/env/manifests/nfs/configure_module_path.pp

 class env::nfs::configure_module_path () {
 
   # Install lmod from g5k repository (bug 12200)
-  # Remove when this is fixed in Debian buster:
+  # Remove when Debian buster 10.7 is released:
   # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=972963
   # When removing, update the "require" of the other resource below.
   env::common::g5kpackages {