feat(instrumenter): update to babel 7.12 (#2592)

See https://babeljs.io/blog/2020/10/15/7.12.0.html

packages/instrumenter/package.json

@@ -30,20 +30,20 @@
   },
   "homepage": "https://stryker-mutator.io",
   "dependencies": {
-    "@babel/core": "~7.11.4",
-    "@babel/generator": "~7.11.4",
-    "@babel/parser": "~7.11.4",
-    "@babel/plugin-proposal-decorators": "~7.10.5",
-    "@babel/preset-typescript": "~7.10.4",
+    "@babel/core": "~7.12.3",
+    "@babel/generator": "~7.12.1",
+    "@babel/parser": "~7.12.3",
+    "@babel/plugin-proposal-decorators": "~7.12.1 ",
+    "@babel/preset-typescript": "~7.12.1 ",
     "@stryker-mutator/api": "4.0.0",
     "@stryker-mutator/util": "4.0.0",
     "angular-html-parser": "~1.7.0"
   },
   "devDependencies": {
-    "@babel/preset-react": "~7.10.4",
+    "@babel/preset-react": "~7.12.1",
     "@stryker-mutator/test-helpers": "4.0.0",
-    "@types/babel__core": "~7.1.9",
-    "@types/babel__generator": "~7.6.1",
+    "@types/babel__core": "~7.1.10",
+    "@types/babel__generator": "~7.6.2",
     "@types/babel__parser": "~7.1.1",
     "@types/chai-jest-snapshot": "~1.3.5",
     "babel-plugin-transform-decorators-legacy": "~1.3.5",