Bump third_party/editline/repo from `4255848` to `50bde4b` #114923

Job	Run time
Build on Darwin (clang, simulated)	50m 53s
Build on Linux (fake, gcc_release, clang, simulated)	48m 33s
Build on Linux (coverage)	17m 50s
Build on Linux (gcc_debug)	51m 33s
Build on Linux (python_lib)	18m 24s
Build on Linux (python lighting-app)	5m 19s
	3h 12m 32s

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