chore(deps): update deps/paho.mqtt.c digest to 6b1e202 #5094

Job	Run time
docker	3m 14s
build-linux (ubuntu-20.04, Debug, 386)	2m 34s
build-windows (windows-2019, Debug, 386)	3m 49s
build-linux (ubuntu-20.04, Debug, amd64)	2m 39s
build-windows (windows-2019, Debug, amd64)	3m 47s
build-linux (ubuntu-20.04, Release, 386)	2m 45s
build-windows (windows-2019, Release, 386)	3m 56s
build-linux (ubuntu-20.04, Release, amd64)	2m 43s
build-windows (windows-2019, Release, amd64)	3m 51s
build-linux (ubuntu-22.04, Debug, 386)	2m 27s
build-windows (windows-2022, Debug, 386)	3m 53s
build-linux (ubuntu-22.04, Debug, amd64)	2m 28s
build-windows (windows-2022, Debug, amd64)	3m 43s
build-linux (ubuntu-22.04, Release, 386)	2m 27s
build-windows (windows-2022, Release, 386)	3m 29s
build-linux (ubuntu-22.04, Release, amd64)	2m 25s
build-windows (windows-2022, Release, amd64)	2m 21s
release	0s
	52m 31s

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