build: bump shelljs from 0.7.8 to 0.8.1

Bumps [shelljs](https://github.com/shelljs/shelljs) from 0.7.8 to 0.8.1.
- [Release notes](https://github.com/shelljs/shelljs/releases)
- [Changelog](https://github.com/shelljs/shelljs/blob/master/CHANGELOG.md)
- [Commits](shelljs/shelljs@v0.7.8...v0.8.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

package.json

@@ -38,7 +38,7 @@
     "npm-run-all": "^4.1.1",
     "open": "^0.0.5",
     "readline-sync": "^1.4.7",
-    "shelljs": "^0.7.8",
+    "shelljs": "^0.8.1",
     "shx": "^0.2.2",
     "tmp": "^0.0.33",
     "tweak-sourcemap-paths": "0.0.3",

yarn.lock

@@ -1173,14 +1173,22 @@ shell-quote@^1.6.1:
     array-reduce "~0.0.0"
     jsonify "~0.0.0"
 
-shelljs@^0.7.0, shelljs@^0.7.3, shelljs@^0.7.8:
+shelljs@^0.7.0, shelljs@^0.7.3:
   version "0.7.8"
   resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.7.8.tgz#decbcf874b0d1e5fb72e14b164a9683048e9acb3"
   dependencies:
     glob "^7.0.0"
     interpret "^1.0.0"
     rechoir "^0.6.2"
 
+shelljs@^0.8.1:
+  version "0.8.1"
+  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.1.tgz#729e038c413a2254c4078b95ed46e0397154a9f1"
+  dependencies:
+    glob "^7.0.0"
+    interpret "^1.0.0"
+    rechoir "^0.6.2"
+
 shx@^0.2.2:
   version "0.2.2"
   resolved "https://registry.yarnpkg.com/shx/-/shx-0.2.2.tgz#0a304d020b0edf1306ad81570e80f0346df58a39"