fix: bump @testing-library/dom from 6.16.0 to 7.0.3 (#80)

BREAKING CHANGE: bumps DTL
Bumps [@testing-library/dom](https://github.com/testing-library/dom-testing-library) from 6.16.0 to 7.0.3.
- [Release notes](https://github.com/testing-library/dom-testing-library/releases)
- [Changelog](https://github.com/testing-library/dom-testing-library/blob/master/CHANGELOG.md)
- [Commits](testing-library/dom-testing-library@v6.16.0...v7.0.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -51,7 +51,7 @@
     "svelte": "3.x"
   },
   "dependencies": {
-    "@testing-library/dom": "^6.5.0"
+    "@testing-library/dom": "^7.0.3"
   },
   "devDependencies": {
     "@babel/cli": "^7.6.2",