fix(deps): update cross-spawn requirement from 6.0.5 to 7.0.0

Updates the requirements on [cross-spawn](https://github.com/moxystudio/node-cross-spawn) to permit the latest version.
- [Release notes](https://github.com/moxystudio/node-cross-spawn/releases)
- [Changelog](https://github.com/moxystudio/node-cross-spawn/blob/master/CHANGELOG.md)
- [Commits](moxystudio/node-cross-spawn@v6.0.5...v7.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -40,7 +40,7 @@
     "caseless": "0.12.0",
     "chai": "4.2.0",
     "clone": "2.1.2",
-    "cross-spawn": "6.0.5",
+    "cross-spawn": "7.0.0",
     "dredd-transactions": "9.0.6",
     "gavel": "8.0.5",
     "glob": "7.1.4",