Update dependency @terraformer/arcgis to v2.1.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@terraformer/arcgis	2.1.1 -> 2.1.2

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Release Notes

terraformer-js/terraformer (@​terraformer/arcgis)

### [`v2.1.2`](https://togithub.com/terraformer-js/terraformer/blob/HEAD/CHANGELOG.md#212) [Compare Source](https://togithub.com/terraformer-js/terraformer/compare/v2.1.1...v2.1.2) ##### Fixed - `@terraformer/spatial` - fix `intersects` for multipolygons - start exporting `applyConverter`

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