Bump third_party/libdatachannel/repo from `59ce380` to `7f42c7d` #2318

Job	Run time
Build Docker CHIP Build images - base	5m 20s
Build Docker CHIP Build images - base (-minimal)	35s
Build Docker CHIP Build images - stage 1 (-crosscompile)	59s
Build Docker CHIP Build images - stage 2 (-ameba)	1m 47s
Build Docker CHIP Build images - stage 2 (-asr)	1m 17s
Build Docker CHIP Build images - stage 2 (-bouffalolab)	17m 46s
Build Docker CHIP Build images - stage 2 (-doxygen)	13s
Build Docker CHIP Build images - stage 2 (-efr32)	1m 36s
Build Docker CHIP Build images - stage 2 (-esp32)	2m 4s
Build Docker CHIP Build images - stage 2 (-infineon)	1m 59s
Build Docker CHIP Build images - stage 2 (-java)	1m 5s
Build Docker CHIP Build images - stage 2 (-nxp)	5m 13s
Build Docker CHIP Build images - stage 2 (-nxp-zephyr)	2m 28s
Build Docker CHIP Build images - stage 2 (-nrf-platform)	3m 39s
Build Docker CHIP Build images - stage 2 (-telink)	4m 16s
Build Docker CHIP Build images - stage 2 (-telink-zephyr_3_3)	3m 50s
Build Docker CHIP Build images - stage 2 (-ti)	1m 6s
Build Docker CHIP Build images - stage 2 (-tizen)	3m 39s
Build Docker CHIP Build images - stage 2 (-openiotsdk)	53s
Build Docker CHIP Build images - stage 3	1s
Build Docker CHIP Build images - vscode	1s
	59m 47s

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