Bug#960808: node-babel7: upgrade to 7.9.6

[Xavier Guimard]

Package: node-babel7
Version: 7.4.5+~cs6.2.2-2
Severity: important
Control: affects -1 twitter-boostrap4

Please upgrade to last published version (7.9.6). This is required at
least to upgrade twitter-bootstrap to 4.5.0