gpi-2 eb: use https for git url.

Golden_Repo/g/gpi-2/gpi2-deepsea-GCC-11.3.0.eb

@@ -13,7 +13,7 @@ local_gpi2_arch_fname = f"gpi2_archive_{version}.tar.gz"
 sources = [{
     'filename': local_gpi2_arch_fname,
     'git_config': {
-        'url': 'git@gitlab.jsc.fz-juelich.de:deep-sea/wp5/software',
+        'url': 'https://gitlab.jsc.fz-juelich.de/deep-sea/wp5/software',
         'repo_name': 'gpi-2',
         'commit': 'deepsea',
         'keep_git_dir': True,