deps: remove form-data/README.md
Having multiples of the same file name with different casings causes problems on lots of OS-s.
Refs: https://github.com/nodejs/node/issues/12624
@vsemozhetbyt think you could check if this fixed the issue for you?
Apologies if this commit is weird, I had to make it in the GitHub GUI.
Checklist
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commit message follows commit guidelines
Affected core subsystem(s)
deps