fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - react from 16.12.0 to 16.13.1.
    See this package in NPM: https://www.npmjs.com/package/react
  - react-dom from 16.12.0 to 16.13.1.
    See this package in NPM: https://www.npmjs.com/package/react-dom

See this project in Snyk:
https://app.snyk.io/org/gerdesque/project/3a74dd5f-3821-4d31-8cc3-455e4ce92d1c?utm_source=github&utm_medium=upgrade-pr

gerdesque/yarn.lock

@@ -12122,17 +12122,7 @@ react-docgen@^5.0.0:
     node-dir "^0.1.10"
     strip-indent "^3.0.0"
 
-[email protected]:
-  version "16.12.0"
-  resolved "https://registry.npmjs.org/react-dom/-/react-dom-16.12.0.tgz#0da4b714b8d13c2038c9396b54a92baea633fe11"
-  integrity sha512-LMxFfAGrcS3kETtQaCkTKjMiifahaMySFDn71fZUNpPHZQEzmk/GiAeIT8JSOrHB23fnuCOMruL2a8NYlw+8Gw==
-  dependencies:
-    loose-envify "^1.1.0"
-    object-assign "^4.1.1"
-    prop-types "^15.6.2"
-    scheduler "^0.18.0"
-
-react-dom@^16.8.3:
+[email protected], react-dom@^16.8.3:
   version "16.13.1"
   resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.13.1.tgz#c1bd37331a0486c078ee54c4740720993b2e0e7f"
   integrity sha512-81PIMmVLnCNLO/fFOQxdQkvEq/+Hfpv24XNJfpyZhTRfO0QcmQIF/PgCa1zCOj2w1hrn12MFLyaJ/G0+Mxtfag==
@@ -12345,16 +12335,7 @@ react-transition-group@^4.3.0:
     loose-envify "^1.4.0"
     prop-types "^15.6.2"
 
-[email protected]:
-  version "16.12.0"
-  resolved "https://registry.npmjs.org/react/-/react-16.12.0.tgz#0c0a9c6a142429e3614834d5a778e18aa78a0b83"
-  integrity sha512-fglqy3k5E+81pA8s+7K0/T3DBCF0ZDOher1elBFzF7O6arXJgzyu/FW+COxFvAWXJoJN9KIZbT2LXlukwphYTA==
-  dependencies:
-    loose-envify "^1.1.0"
-    object-assign "^4.1.1"
-    prop-types "^15.6.2"
-
-react@^16.8.3:
+[email protected], react@^16.8.3:
   version "16.13.1"
   resolved "https://registry.yarnpkg.com/react/-/react-16.13.1.tgz#2e818822f1a9743122c063d6410d85c1e3afe48e"
   integrity sha512-YMZQQq32xHLX0bz5Mnibv1/LHb3Sqzngu7xstSM+vrkE5Kzr9xE0yMByK5kMoTK30YVJE61WfbxIFFvfeDKT1w==
@@ -13074,14 +13055,6 @@ saxes@^3.1.9:
   dependencies:
     xmlchars "^2.1.1"
 
-scheduler@^0.18.0:
-  version "0.18.0"
-  resolved "https://registry.npmjs.org/scheduler/-/scheduler-0.18.0.tgz#5901ad6659bc1d8f3fdaf36eb7a67b0d6746b1c4"
-  integrity sha512-agTSHR1Nbfi6ulI0kYNK0203joW2Y5W4po4l+v03tOoiJKpTBbxpNhWDvqc/4IcOw+KLmSiQLTasZ4cab2/UWQ==
-  dependencies:
-    loose-envify "^1.1.0"
-    object-assign "^4.1.1"
-
 scheduler@^0.19.1:
   version "0.19.1"
   resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.19.1.tgz#4f3e2ed2c1a7d65681f4c854fa8c5a1ccb40f196"