fix: typo in 'multiformats' type defs

[rvagg]

Fixes: #3776

It'd be nice to have some kind of tests that caught this, but that might mean adding typescript examples that use this which is probably a fair bit of work. @achingbrain thoughts?

[rvagg]

whoa boy, that's uncovered a bunch of type failures in Actions, mostly where we're allowing strings in JS but our types are strict about CID

[achingbrain]

We really need to do something. There is an example for using ipfs from ts but it doesn't catch this stuff, not 100% sure why not.

Adding types to the interface tests would probably help here but it's a big job.

Ref: ipfs/aegir#849

[rvagg]

k, so the change here is to go with the strict CID requirement and remove the option to provide strings in these places. SGTM although it'll be interesting to see user feedback as more people start adopting the latest and find their flexibility removed.