Update dependency foreground-child to v4

Author: renovate[bot]

package-lock.json

@@ -22,7 +22,7 @@
     },
     "dependencies": {
         "@datadog/pprof": "^5.12.0",
-        "foreground-child": "^3.3.1",
+        "foreground-child": "^4.0.1",
         "pprof-format": "^2.2.1",
         "signal-exit": "^4.1.0"
     },