deps: Upgrade babel-related dependencies.

Done with `yarn upgrade --latest $(tools/deps | grep 'babel')`.

Also tried `yarn upgrade --latest --pattern 'babel', which seems to
be equivalent.

Got just one warning, and it wasn't a peer-dep warning:

"""
warning rollup-plugin-babel@4.4.0: This package has been deprecated
and is no longer maintained. Please use @rollup/plugin-babel.
"""

In the next commit, we'll switch to that newer package.

This covers (and goes beyond) facebook/react-native@cef001713, part
of the RN v0.61 -> v0.62 changes to the template app [1], in which
`metro-react-native-babel-preset` is taken from ^0.56.0 to ^0.58.0.

Also, run `yarn yarn-deduplicate && yarn` as prompted by
`tools/test deps`.

[1] https://react-native-community.github.io/upgrade-helper/?from=0.61.5&to=0.62.2

Author: chrisbobbe

package.json

@@ -92,8 +92,8 @@
     "zulip-markdown-parser": "^1.0.6"
   },
   "devDependencies": {
-    "@babel/core": "^7.6.2",
-    "@babel/preset-env": "^7.6.3",
+    "@babel/core": "^7.11.4",
+    "@babel/preset-env": "^7.11.0",
     "@babel/runtime": "^7.6.2",
     "@jest/source-map": "^26.1.0",
     "babel-eslint": "^10.0.3",
@@ -120,15 +120,15 @@
     "jest-extended": "^0.11.5",
     "jetifier": "^1.6.5",
     "lolex": "^5.1.1",
-    "metro-react-native-babel-preset": "^0.56.0",
+    "metro-react-native-babel-preset": "^0.63.0",
     "prettier": "^1.18.2",
     "prettier-eslint": "^11.0.0",
     "prettier-eslint-cli": "^5.0.0",
     "prop-types": "^15.7.2",
     "react-native-cli": "^2.0.1",
     "redux-mock-store": "^1.5.1",
     "rollup": "^1.23.1",
-    "rollup-plugin-babel": "^4.3.3",
+    "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-node-resolve": "^5.2.0",
     "yarn-deduplicate": "^1.1.1"
   }