Update babel monorepo to v7.15.0 (#1084)

Co-authored-by: renovate[bot] <renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

demo/preact-map/package.json

@@ -13,8 +13,8 @@
     "preact": "10.5.14"
   },
   "devDependencies": {
-    "@babel/core": "7.14.8",
-    "@babel/preset-env": "7.14.9",
+    "@babel/core": "7.15.0",
+    "@babel/preset-env": "7.15.0",
     "@babel/plugin-transform-react-jsx": "7.14.9",
     "babel-loader": "8.2.2",
     "css-loader": "6.2.0",

demo/react-map/package.json

@@ -14,8 +14,8 @@
     "react-dom": "17.0.2"
   },
   "devDependencies": {
-    "@babel/core": "7.14.8",
-    "@babel/preset-env": "7.14.9",
+    "@babel/core": "7.15.0",
+    "@babel/preset-env": "7.15.0",
     "@babel/plugin-transform-react-jsx": "7.14.9",
     "babel-loader": "8.2.2",
     "css-loader": "6.2.0",

package.json

@@ -40,8 +40,8 @@
     "@ampproject/filesize": "4.3.0",
     "@ampproject/rollup-plugin-closure-compiler": "0.26.0",
     "@babel/cli": "7.14.8",
-    "@babel/core": "7.14.8",
-    "@babel/preset-env": "7.14.9",
+    "@babel/core": "7.15.0",
+    "@babel/preset-env": "7.15.0",
     "@rollup/plugin-babel": "5.3.0",
     "@rollup/plugin-replace": "3.0.0",
     "@types/node": "14.17.7",