chore(deps): update deps/paho.mqtt.c digest to 6b1e202 #5171

Job	Run time
build-linux (ubuntu-20.04, Debug, 386)	2m 19s
build-windows (windows-2019, Debug, 386)	3m 40s
build-linux (ubuntu-20.04, Debug, amd64)	2m 33s
docker	2m 36s
build-windows (windows-2019, Debug, amd64)	3m 20s
build-linux (ubuntu-20.04, Release, 386)	2m 34s
build-windows (windows-2019, Release, 386)	2m 17s
build-linux (ubuntu-20.04, Release, amd64)	2m 33s
build-windows (windows-2019, Release, amd64)	2m 25s
build-linux (ubuntu-22.04, Debug, 386)	2m 9s
build-windows (windows-2022, Debug, 386)	3m 46s
build-linux (ubuntu-22.04, Debug, amd64)	2m 18s
build-windows (windows-2022, Debug, amd64)	1m 31s
build-linux (ubuntu-22.04, Release, 386)	2m 6s
build-windows (windows-2022, Release, 386)	1m 32s
build-linux (ubuntu-22.04, Release, amd64)	2m 3s
build-windows (windows-2022, Release, amd64)	1m 19s
release	0s
	41m 1s

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