chore(deps): update deps/paho.mqtt.c digest to 6b1e202 #7675

Job	Run time
build-linux (ubuntu-20.04, Debug, 386)	2m 24s
build-windows (windows-2019, Debug, 386)	3m 23s
build-linux (ubuntu-20.04, Debug, amd64)	2m 26s
build-windows (windows-2019, Debug, amd64)	3m 32s
docker	2m 17s
build-linux (ubuntu-20.04, Release, 386)	2m 29s
build-windows (windows-2019, Release, 386)	3m 31s
build-linux (ubuntu-20.04, Release, amd64)	2m 29s
build-windows (windows-2019, Release, amd64)	3m 36s
build-linux (ubuntu-22.04, Debug, 386)	2m 13s
build-windows (windows-2022, Debug, 386)	3m 34s
build-linux (ubuntu-22.04, Debug, amd64)	2m 22s
build-windows (windows-2022, Debug, amd64)	3m 33s
build-linux (ubuntu-22.04, Release, 386)	2m 28s
build-windows (windows-2022, Release, 386)	3m 29s
build-linux (ubuntu-22.04, Release, amd64)	2m 28s
build-windows (windows-2022, Release, amd64)	3m 35s
release	0s
	49m 49s

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