#2945, 2928: Update shelljs for better node14 considerations

package.json

@@ -134,7 +134,7 @@
     "object-hash": "^1.1.8",
     "platformsh-client": "^0.1.129",
     "semver": "^7.3.2",
-    "shelljs": "0.7.8",
+    "shelljs": "^0.8.4",
     "string-argv": "0.1.1",
     "sudo-block": "^2.0.0",
     "tar": "^6.0.2",
@@ -181,4 +181,4 @@
     "vuepress-plugin-robots": "^1.0.1",
     "vuepress-plugin-sitemap": "https://github.com/ekoeryanto/vuepress-plugin-sitemap#dd8b9763b2c7939668a67f2afa34de501dea45d4"
   }
-}
+}

yarn.lock

@@ -9241,10 +9241,10 @@ shebang-regex@^1.0.0:
   resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
   integrity sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=
 
-shelljs@0.7.8:
-  version "0.7.8"
-  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.7.8.tgz#decbcf874b0d1e5fb72e14b164a9683048e9acb3"
-  integrity sha1-3svPh0sNHl+3LhSxZKloMEjprLM=
+shelljs@^0.8.4:
+  version "0.8.4"
+  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.4.tgz#de7684feeb767f8716b326078a8a00875890e3c2"
+  integrity sha512-7gk3UZ9kOfPLIAbslLzyWeGiEqx9e3rxwZM0KE6EL8GlGwjym9Mrlx5/p33bWTu9YG6vcS4MBxYZDHYr5lr8BQ==
   dependencies:
     glob "^7.0.0"
     interpret "^1.0.0"