Upgrade babel to 7.13 (#19909)

There is a bug (https://github.com/babel/babel/issues/12631) in @babel/traverse which requires us to pin this dependency, but since this babel upgrade blocks us adopting storybook 6.2, I want to push this out _before_ this dependency is fixed. (Which, according to the issue, can take a while)

package.json

@@ -81,12 +81,12 @@
   },
   "devDependencies": {
     "@atlassian/aui": "^7.10.1",
-    "@babel/core": "^7.12.3",
-    "@babel/plugin-proposal-class-properties": "^7.12.1",
-    "@babel/plugin-proposal-decorators": "^7.12.1",
-    "@babel/preset-env": "^7.12.1",
-    "@babel/preset-typescript": "^7.12.1",
-    "@babel/runtime": "^7.12.5",
+    "@babel/core": "^7.13.0",
+    "@babel/plugin-proposal-class-properties": "^7.13.0",
+    "@babel/plugin-proposal-decorators": "^7.13.0",
+    "@babel/preset-env": "^7.13.0",
+    "@babel/preset-typescript": "^7.13.0",
+    "@babel/runtime": "^7.13.0",
     "@gql2ts/from-schema": "^1.10.1",
     "@gql2ts/language-typescript": "^1.9.0",
     "@gql2ts/types": "^1.9.0",
@@ -363,6 +363,7 @@
   },
   "resolutions": {
     "history": "4.5.1",
-    "cssnano": "4.1.10"
+    "cssnano": "4.1.10",
+    "@babel/traverse": "7.12.5"
   }
 }