Fix newline handling

[timwu]

Found out the hard way that not stripping off newlines causes the frank.service to hang by doing:

echo 7200 | http POST 123.123.123.123:8000/temperature/left

There should be no particular reason to send a newline for the temperature and temperature-duration paths so just strip newlines to prevent this hang.

Also, hit some build failures and cargo suggested bumping the deps. So that is here as well.