Bump execa from 1.0.0 to 5.1.1

Bumps [execa](https://github.com/sindresorhus/execa) from 1.0.0 to 5.1.1.
- [Release notes](https://github.com/sindresorhus/execa/releases)
- [Commits](sindresorhus/execa@v1.0.0...v5.1.1)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -86,7 +86,7 @@
     "bottleneck": "^2.19.5",
     "codelyzer": "~5.0.0",
     "del": "^4.1.0",
-    "execa": "^1.0.0",
+    "execa": "^5.1.1",
     "filenamify": "^4.1.0",
     "fs-extra": "^7.0.1",
     "gulp": "^4.0.0",