fix: packages/san-cli-plugin-babel/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AJV-15274295

Author: snyk-bot

packages/san-cli-plugin-babel/package.json

@@ -37,7 +37,7 @@
         "@babel/preset-env": "^7.6.3",
         "@babel/runtime": "^7.6.3",
         "@babel/runtime-corejs3": "^7.6.3",
-        "babel-loader": "^8.0.6",
+        "babel-loader": "^10.0.0",
         "core-js": "^3.6.4",
         "regenerator-runtime": "^0.13.7",
         "thread-loader": "^3.0.4",