CI: Changing dev docs ssh key
#26591 made master builds to fail. Looks like there was a problem with the ssh keys. I regenerated them and updated them in the github deployment keys and azure pipelines secret. Updating the settings here.

CC: @jreback 

ok let's try looks like it's not working, now the keys are surely correct :(

will revert the changes and stay with travis, besides the error azure doesn't seem reliable