Update dependency nodemon to ^2.0.21

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nodemon (source)	^2.0.20 -> ^2.0.21

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Release Notes

remy/nodemon

v2.0.21

Compare Source

Bug Fixes

• remove ts mapping if loader present (1468397), closes #​2083

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