doc: remove reference to stale CITGM job
Remove reference to job that is out of date, hast not been run for a long time and likely does not work properly.
Refs: https://github.com/nodejs/citgm/issues/741
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines