Bump @rollup/plugin-node-resolve from 15.2.0 to 15.2.1 (#29)

Bumps [@rollup/plugin-node-resolve](https://github.com/rollup/plugins/tree/HEAD/packages/node-resolve) from 15.2.0 to 15.2.1.
- [Changelog](https://github.com/rollup/plugins/blob/master/packages/node-resolve/CHANGELOG.md)
- [Commits](https://github.com/rollup/plugins/commits/node-resolve-v15.2.1/packages/node-resolve)

---
updated-dependencies:
- dependency-name: "@rollup/plugin-node-resolve"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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