resolver-conf: change shebang in resolver_rpcd.py to Python3
Suggested by @wkb7hHJzyW3z4mMQ .
Fixes https://gitlab.labs.nic.cz/turris/turris-build/issues/145
cc: @jpavlinec
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Suggested by @wkb7hHJzyW3z4mMQ .
Fixes https://gitlab.labs.nic.cz/turris/turris-build/issues/145
cc: @jpavlinec