chore(deps): update deps/paho.mqtt.cpp digest to 4691652 #5140

Job	Run time
build-linux (ubuntu-20.04, Debug, 386)	2m 37s
docker	3m 10s
build-linux (ubuntu-20.04, Debug, amd64)	2m 30s
build-windows (windows-2019, Debug, 386)	4m 31s
build-linux (ubuntu-20.04, Release, 386)	2m 29s
build-windows (windows-2019, Debug, amd64)	3m 35s
build-linux (ubuntu-20.04, Release, amd64)	2m 36s
build-windows (windows-2019, Release, 386)	3m 24s
build-linux (ubuntu-22.04, Debug, 386)	2m 20s
build-windows (windows-2019, Release, amd64)	3m 15s
build-linux (ubuntu-22.04, Debug, amd64)	2m 21s
build-windows (windows-2022, Debug, 386)	3m 15s
build-linux (ubuntu-22.04, Release, 386)	2m 27s
build-windows (windows-2022, Debug, amd64)	3m 19s
build-linux (ubuntu-22.04, Release, amd64)	2m 35s
build-windows (windows-2022, Release, 386)	3m 13s
build-windows (windows-2022, Release, amd64)	3m 1s
release	0s
	50m 38s

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