deps(dev): bump execa from 6.1.0 to 7.0.0 (#421)

Bumps [execa](https://github.com/sindresorhus/execa) from 6.1.0 to 7.0.0.
- [Release notes](https://github.com/sindresorhus/execa/releases)
- [Commits](sindresorhus/execa@v6.1.0...v7.0.0)

---
updated-dependencies:
- dependency-name: execa
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alex Potsides <alex@achingbrain.net>

package.json

@@ -198,7 +198,7 @@
     "aegir": "^38.1.2",
     "datastore-level": "^9.0.0",
     "delay": "^5.0.0",
-    "execa": "^6.0.0",
+    "execa": "^7.0.0",
     "it-filter": "^2.0.0",
     "it-last": "^2.0.0",
     "lodash.random": "^3.2.0",