Update dependency pkg-dir to v4

Author: renovate-bot

@commitlint/cli/package.json

@@ -63,7 +63,7 @@
     "cross-env": "5.1.1",
     "execa": "0.11.0",
     "mkdirp": "0.5.1",
-    "pkg-dir": "2.0.0",
+    "pkg-dir": "4.2.0",
     "resolve-bin": "0.4.0",
     "sander": "0.6.0",
     "string-to-stream": "1.1.1",

yarn.lock

@@ -8869,6 +8869,13 @@ [email protected], pkg-dir@^2.0.0:
   dependencies:
     find-up "^2.1.0"
 
+[email protected]:
+  version "4.2.0"
+  resolved "https://registry.npmjs.org/pkg-dir/-/pkg-dir-4.2.0.tgz#f099133df7ede422e81d1d8448270eeb3e4261f3"
+  integrity sha512-HRDzbaKjC+AOWVXxAU/x54COGeIv9eb+6CkDSQoNTt4XyWoIJvuPsXizxu/Fr23EiekbtZwmh1IcIG/l/a10GQ==
+  dependencies:
+    find-up "^4.0.0"
+
 pkg-dir@^1.0.0:
   version "1.0.0"
   resolved "https://registry.npmjs.org/pkg-dir/-/pkg-dir-1.0.0.tgz#7a4b508a8d5bb2d629d447056ff4e9c9314cf3d4"