package/mosquitto: bump to version 2.0.20 Signed-off-by: Francois Perrad <francois.perrad@gadz.org> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> (cherry picked from commit 2a74b3b7c490d051a5ab8efddecfe0716fb17fc3) Signed-off-by: Peter Korsgaard <peter@korsgaard.com>