Bump prop-types from 15.8.0 to 15.8.1 in /docs (#1915)

Bumps [prop-types](https://github.com/facebook/prop-types) from 15.8.0 to 15.8.1.
- [Release notes](https://github.com/facebook/prop-types/releases)
- [Changelog](https://github.com/facebook/prop-types/blob/main/CHANGELOG.md)
- [Commits](facebook/prop-types@v15.8.0...v15.8.1)

---
updated-dependencies:
- dependency-name: prop-types
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jon Rohan <[email protected]>

Author: dependabot[bot]

docs/package.json

@@ -35,7 +35,7 @@
     "postcss-loader": "4.3.0",
     "postcss-scss": "4.0.2",
     "postcss-simple-vars": "6.0.3",
-    "prop-types": "^15.8.0",
+    "prop-types": "^15.8.1",
     "raw-loader": "^4.0.2",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",

docs/yarn.lock

@@ -15631,10 +15631,10 @@ prompts@^2.0.1, prompts@^2.3.2, prompts@^2.4.0:
     kleur "^3.0.3"
     sisteransi "^1.0.5"
 
-prop-types@^15.0.0, prop-types@^15.5.4, prop-types@^15.6.0, prop-types@^15.6.1, prop-types@^15.6.2, prop-types@^15.7.2, prop-types@^15.8.0:
-  version "15.8.0"
-  resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.8.0.tgz#d237e624c45a9846e469f5f31117f970017ff588"
-  integrity sha512-fDGekdaHh65eI3lMi5OnErU6a8Ighg2KjcjQxO7m8VHyWjcPyj5kiOgV1LQDOOOgVy3+5FgjXvdSSX7B8/5/4g==
+prop-types@^15.0.0, prop-types@^15.5.4, prop-types@^15.6.0, prop-types@^15.6.1, prop-types@^15.6.2, prop-types@^15.7.2, prop-types@^15.8.1:
+  version "15.8.1"
+  resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.8.1.tgz#67d87bf1a694f48435cf332c24af10214a3140b5"
+  integrity sha512-oj87CgZICdulUohogVAR7AjlC0327U4el4L6eAvOqCeudMDVU0NThNaV+b9Df4dXgSP1gXMTnPdhfe/2qDH5cg==
   dependencies:
     loose-envify "^1.4.0"
     object-assign "^4.1.1"