Lock @types/node to v16.x (also fixes mongo)

[evantahler]

Locked the version of @types/node that we use to the v16 version (because that's the version of node we use). Mongo introduced an incompatibility (mongodb/node-mongodb-native#3088) with v17 of @types/node. They are fixing it soon, but regardless, we should have locked the @types package to the latest major version of node Grouparoo supports.

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[pauloouriques]

Worked like a charm here.

[pauloouriques]

Great!