[grenoble] Update ram_size for g5k-checks v0.5 (#6119)

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-55.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-56.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-57.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-58.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-59.json

data/grid5000/sites/grenoble/clusters/edel/nodes/edel-6.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-60.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-61.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-62.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-63.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-64.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-65.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-66.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-67.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-68.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-69.json

data/grid5000/sites/grenoble/clusters/edel/nodes/edel-7.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-70.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-71.json

.../grid5000/sites/grenoble/clusters/edel/nodes/edel-72.json