Fix/invalid error propagation custom scalars (backport for 16.x.x)

[stenreijers]

This is the same fix for invalid error propagation on custom scalars, but now backported for 16.x.x

see:
#3837

[github-actions]

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[stenreijers]

I had to do two commits, because I run locally with a newer version of NPM, so the second commit is to restore the original package-lock.json such that github can do its checks.

[stenreijers]

Any ETA on this backport @IvanGoncharov ?

[IvanGoncharov]

@stenreijers Sorry for the delay.
Looking at it right now.

[stenreijers]

@IvanGoncharov when can we expect a bump on the 16.x branch for a new npm package?

[IvanGoncharov]

@stenreijers I will do release on Friday 📦