Merge pull request #154 from hashicorp/ds.cms-rivet

Author: dstaley

.changeset/little-rules-invent.md

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+---
+'@hashicorp/platform-nextjs-plugin': minor
+---
+
+Use graphql-tag/loader to support #import statements in graphql files

.changeset/proud-berries-deliver.md

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+---
+'@hashicorp/platform-types': minor
+---
+
+Remove empty module declaration for rivet-graphql

.changeset/strange-mugs-yawn.md

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+---
+'@hashicorp/platform-cms': minor
+---
+
+Upgrade rivet-graphql to latest version