tools: update marked to 0.4.0
Update marked to 0.4.0 for use with the tools/doc/*.js tools.
Ref: https://nodesecurity.io/advisories/531
(Yes, that is extraordinarily unlikely to impact us in this context.)
@styfle @vsemozhetbyt
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines