Use bash instead of sh for running the elevated process on Linux and Mac
Use bash instead of sh for running the elevated process on Linux and Mac

Change-type: patch
Changelog-entry: Use bash instead of sh for running the elevated process on Linux and Mac

resin-io/etcher,resin-io/herostratus,resin-io/herostratus,resin-io/etcher,resin-io/etcher,resin-io/etcher,resin-io/resin-etcher,resin-io/etcher,resin-io/resin-etcher