Bump prop-types from 15.6.2 to 15.7.1 (#1780) [ci skip]

Bumps [prop-types](https://github.com/facebook/prop-types) from 15.6.2 to 15.7.1.
- [Release notes](https://github.com/facebook/prop-types/releases)
- [Changelog](https://github.com/facebook/prop-types/blob/master/CHANGELOG.md)
- [Commits](facebook/prop-types@v15.6.2...v15.7.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -96,7 +96,7 @@
     "preact": "^8.4.2",
     "preact-compat": "^3.18.4",
     "preact-textarea-autosize": "^4.0.7",
-    "prop-types": "^15.6.2",
+    "prop-types": "^15.7.1",
     "pusher-js": "^4.3.1",
     "twilio-video": "^1.15.1"
   }

yarn.lock

@@ -8554,13 +8554,13 @@ prompts@^0.1.9:
     kleur "^2.0.1"
     sisteransi "^0.1.1"
 
-prop-types@^15.5.10, prop-types@^15.5.4, prop-types@^15.5.8, prop-types@^15.5.9, prop-types@^15.6.0, prop-types@^15.6.1, prop-types@^15.6.2:
-  version "15.6.2"
-  resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.6.2.tgz#05d5ca77b4453e985d60fc7ff8c859094a497102"
-  integrity sha512-3pboPvLiWD7dkI3qf3KbUe6hKFKa52w+AE0VCqECtf+QHAKgOL37tTaNCnuX1nAAQ4ZhyP+kYVKf8rLmJ/feDQ==
+prop-types@^15.5.10, prop-types@^15.5.4, prop-types@^15.5.8, prop-types@^15.5.9, prop-types@^15.6.0, prop-types@^15.6.1, prop-types@^15.6.2, prop-types@^15.7.1:
+  version "15.7.1"
+  resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.7.1.tgz#2fa61e0a699d428b40320127733ee2931f05d9d1"
+  integrity sha512-f8Lku2z9kERjOCcnDOPm68EBJAO2K00Q5mSgPAUE/gJuBgsYLbVy6owSrtcHj90zt8PvW+z0qaIIgsIhHOa1Qw==
   dependencies:
-    loose-envify "^1.3.1"
     object-assign "^4.1.1"
+    react-is "^16.8.1"
 
 property-expr@^1.5.0:
   version "1.5.1"
@@ -8839,6 +8839,11 @@ react-inspector@^2.2.2:
     is-dom "^1.0.9"
     prop-types "^15.6.1"
 
+react-is@^16.8.1:
+  version "16.8.1"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.8.1.tgz#a80141e246eb894824fb4f2901c0c50ef31d4cdb"
+  integrity sha512-ioMCzVDWvCvKD8eeT+iukyWrBGrA3DiFYkXfBsVYIRdaREZuBjENG+KjrikavCLasozqRWTwFUagU/O4vPpRMA==
+
 react-lifecycles-compat@^3.0.0, react-lifecycles-compat@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/react-lifecycles-compat/-/react-lifecycles-compat-3.0.4.tgz#4f1a273afdfc8f3488a8c516bfda78f872352362"