Upgrade to React@17

package.json

@@ -64,8 +64,8 @@
     "matrix-react-sdk": "github:matrix-org/matrix-react-sdk#develop",
     "matrix-widget-api": "^0.1.0-beta.14",
     "prop-types": "^15.7.2",
-    "react": "^16.14.0",
-    "react-dom": "^16.14.0",
+    "react": "^17.0.2",
+    "react-dom": "^17.0.2",
     "sanitize-html": "^2.3.2",
     "ua-parser-js": "^0.7.24"
   },

yarn.lock

@@ -7715,9 +7715,9 @@ matrix-mock-request@^1.2.3:
     qrcode "^1.4.4"
     qs "^6.9.6"
     re-resizable "^6.9.0"
-    react "^16.14.0"
+    react "^17.0.2"
     react-beautiful-dnd "^4.0.1"
-    react-dom "^16.14.0"
+    react-dom "^17.0.2"
     react-focus-lock "^2.5.0"
     react-transition-group "^4.4.1"
     resize-observer-polyfill "^1.5.1"
@@ -10115,15 +10115,14 @@ react-clientside-effect@^1.2.2:
   dependencies:
     "@babel/runtime" "^7.0.0"
 
-react-dom@^16.14.0:
-  version "16.14.0"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.14.0.tgz#7ad838ec29a777fb3c75c3a190f661cf92ab8b89"
-  integrity sha512-1gCeQXDLoIqMgqD3IO2Ah9bnf0w9kzhwN5q4FGnHZ67hBm9yePzB5JJAIQCc8x3pFnNlwFq4RidZggNAAkzWWw==
+react-dom@^17.0.2:
+  version "17.0.2"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-17.0.2.tgz#ecffb6845e3ad8dbfcdc498f0d0a939736502c23"
+  integrity sha512-s4h96KtLDUQlsENhMn1ar8t2bEa+q/YAtj8pPPdIjPDGBDIVNsrD9aXNWqspUe6AzKCIG0C1HZZLqLV7qpOBGA==
   dependencies:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
-    prop-types "^15.6.2"
-    scheduler "^0.19.1"
+    scheduler "^0.20.2"
 
 react-focus-lock@^2.5.0:
   version "2.5.0"
@@ -10184,14 +10183,13 @@ react-transition-group@^4.4.1:
     loose-envify "^1.4.0"
     prop-types "^15.6.2"
 
-react@^16.14.0:
-  version "16.14.0"
-  resolved "https://registry.yarnpkg.com/react/-/react-16.14.0.tgz#94d776ddd0aaa37da3eda8fc5b6b18a4c9a3114d"
-  integrity sha512-0X2CImDkJGApiAlcf0ODKIneSwBPhqJawOa5wCtKbu7ZECrmS26NvtSILynQ66cgkT/RJ4LidJOc3bUESwmU8g==
+react@^17.0.2:
+  version "17.0.2"
+  resolved "https://registry.yarnpkg.com/react/-/react-17.0.2.tgz#d0b5cc516d29eb3eee383f75b62864cfb6800037"
+  integrity sha512-gnhPt75i/dq/z3/6q/0asP78D0u592D5L1pd7M8P+dck6Fu/jJeL6iVVK23fptSUZj8Vjf++7wXA8UNclGQcbA==
   dependencies:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
-    prop-types "^15.6.2"
 
 read-cache@^1.0.0:
   version "1.0.0"
@@ -10749,6 +10747,14 @@ scheduler@^0.19.1:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
 
+scheduler@^0.20.2:
+  version "0.20.2"
+  resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.20.2.tgz#4baee39436e34aa93b4874bddcbf0fe8b8b50e91"
+  integrity sha512-2eWfGgAqqWFGqtdMmcL5zCMK1U8KlXv8SQFGglL3CEtd0aDVDWgeF/YoCmvln55m5zSk3J/20hTaSBeSObsQDQ==
+  dependencies:
+    loose-envify "^1.1.0"
+    object-assign "^4.1.1"
+
 schema-utils@^0.4.5:
   version "0.4.7"
   resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-0.4.7.tgz#ba74f597d2be2ea880131746ee17d0a093c68187"