Bump execa from 3.3.0 to 3.4.0

Bumps [execa](https://github.com/sindresorhus/execa) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/sindresorhus/execa/releases)
- [Commits](sindresorhus/execa@v3.3.0...v3.4.0)

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

package.json

@@ -23,7 +23,7 @@
     "axios": "^0.19.0",
     "bunyan": "^1.8.12",
     "dateformat": "^3.0.3",
-    "execa": "^3.3.0",
+    "execa": "^3.4.0",
     "gunzip-file": "^0.1.1",
     "human-number": "^1.0.4",
     "ioredis": "^4.14.1",