[sophia/ubv] Set debian11-x64-std as default env

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-1.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-10.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-11.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-12.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-14.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-16.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-17.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-18.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-2.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-25.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-26.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-27.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-28.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-29.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-31.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-33.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-34.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-35.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-36.json

data/grid5000/sites/sophia/clusters/uvb/nodes/uvb-37.json