CI builds: revert patch-package upgrade to fix patch errors

This fixes a build error caused by a recent version bump of 'patch-package':
"Patch file found for package execa which is not present at node_modules/qqjs/node_modules/execa"

Change-type: patch

npm-shrinkwrap.json

@@ -13682,9 +13682,9 @@
       }
     },
     "patch-package": {
-      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/patch-package/-/patch-package-6.2.0.tgz",
-      "integrity": "sha512-HWlQflaBBMjLBfOWomfolF8aqsFDeNbSNro1JDUgYqnVvPM5OILJ9DQdwIRiKmGaOsmHvhkl1FYkvv1I9r2ZJw==",
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/patch-package/-/patch-package-6.1.2.tgz",
+      "integrity": "sha512-5GnzR8lEyeleeariG+hGabUnD2b1yL7AIGFjlLo95zMGRWhZCel58IpeKD46wwPb7i+uNhUI8unV56ogk8Bgqg==",
       "requires": {
         "@yarnpkg/lockfile": "^1.1.0",
         "chalk": "^2.4.2",

package.json

@@ -213,7 +213,7 @@
     "node-unzip-2": "^0.2.8",
     "oclif": "^1.15.2",
     "open": "^7.0.2",
-    "patch-package": "^6.2.0",
+    "patch-package": "6.1.2",
     "prettyjson": "^1.1.3",
     "progress-stream": "^2.0.0",
     "raven": "^2.5.0",