Update babel monorepo to v7.12.0

Author: renovate-bot

package.json

@@ -80,10 +80,10 @@
     "@aureooms/js-itertools": "^4.1.0"
   },
   "devDependencies": {
-    "@babel/cli": "7.11.6",
-    "@babel/core": "7.11.6",
-    "@babel/preset-env": "7.11.5",
-    "@babel/register": "7.11.5",
+    "@babel/cli": "7.12.0",
+    "@babel/core": "7.12.0",
+    "@babel/preset-env": "7.12.0",
+    "@babel/register": "7.12.0",
     "ava": "3.13.0",
     "babel-plugin-transform-remove-console": "6.9.4",
     "babel-plugin-unassert": "3.0.1",