Unlock deps

[cesine]

We found react-dev-utils was introducing multiple versions of other libs we consume such as @babel/code-frame due to the locked deps.

Excerpt from our yarn.lock:

react-dev-utils@^11.0.0:
  version "11.0.1"
  resolved "http://artifactory.shuttercorp.net/artifactory/api/npm/npm-composite/react-dev-utils/-/react-dev-utils-11.0.1.tgz#30106c2055acfd6b047d2dc478a85c356e66fe45"
  integrity sha1-MBBsIFWs/WsEfS3EeKhcNW5m/kU=
  dependencies:
    "@babel/code-frame" "7.10.4"
    address "1.1.2"
    browserslist "4.14.2"
    chalk "2.4.2"
    cross-spawn "7.0.3"
    detect-port-alt "1.1.6"
    escape-string-regexp "2.0.0"
    filesize "6.1.0"
    find-up "4.1.0"
    fork-ts-checker-webpack-plugin "4.1.6"
    global-modules "2.0.0"
    globby "11.0.1"
    gzip-size "5.1.1"
    immer "7.0.9"
    is-root "2.1.0"
    loader-utils "2.0.0"
    open "^7.0.2"
    pkg-up "3.1.0"
    prompts "2.4.0"
    react-error-overlay "^6.0.8"
    recursive-readdir "2.2.2"
    shell-quote "1.7.2"
    strip-ansi "6.0.0"
    text-table "0.2.0"

I looked for why this might be the case, it seems unintentional. normally I would also check in the yarn.lock when using unlocked deps, but #7765 (comment) asks that it be gitignored

ensure that our CI installs the latest versions of packages to discover potential issues our users may encounter.

• [ ] run this PR in CI to find out if it does fail with latest deps
  Other PRs are failing too, so CI cant be used to measure this PR

And locally

$ ./tasks/e2e-simple.sh
~/create-react-app/packages/react-error-overlay/src/__tests__/extract-source-map.js
  28:5  error  Avoid calling `expect` conditionally`  jest/no-conditional-expect

~/create-react-app/packages/react-error-overlay/src/__tests__/get-source-map.js
  58:5  error  Avoid calling `expect` conditionally`  jest/no-conditional-expect
  59:5  error  Avoid calling `expect` conditionally`  jest/no-conditional-expect

~/create-react-app/packages/react-error-overlay/src/__tests__/parser/generic.js
  15:5  error  Avoid calling `expect` conditionally`  jest/no-conditional-expect
  16:5  error  Avoid calling `expect` conditionally`  jest/no-conditional-expect
  25:5  error  Avoid calling `expect` conditionally`  jest/no-conditional-expect
  26:5  error  Avoid calling `expect` conditionally`  jest/no-conditional-expect

✖ 7 problems (7 errors, 0 warnings)

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