Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `app/javascript/mastodon/features/compose/components/poll_form.js`:
  Upstream bumped poll option character limit, but we already had
  a higher one, kept ours.
- `app/validators/poll_validator.rb`:
  Upstream bumped poll option character limit, but we already had
  a higher one, kept ours.
- `config/initializers/content_security_policy.rb`:
  Upstream added a rule, the way we compute ours is different, but
  that added rule has been ported.
- `package.json`:
  No real conflict, dependency update. Performed the same update.
- `yarn.lock`:
  No real conflict, dependency update. Performed the same update.

package.json

@@ -65,17 +65,17 @@
     "@babel/plugin-proposal-decorators": "^7.8.3",
     "@babel/plugin-transform-react-inline-elements": "^7.9.0",
     "@babel/plugin-transform-runtime": "^7.9.0",
-    "@babel/preset-env": "^7.8.3",
-    "@babel/preset-react": "^7.8.3",
+    "@babel/preset-env": "^7.9.0",
+    "@babel/preset-react": "^7.9.4",
     "@babel/runtime": "^7.8.4",
     "@clusterws/cws": "^0.17.3",
     "@gamestdio/websocket": "^0.3.2",
     "array-includes": "^3.1.1",
     "arrow-key-navigation": "^1.1.0",
     "atrament": "0.2.4",
-    "autoprefixer": "^9.7.4",
+    "autoprefixer": "^9.7.5",
     "axios": "^0.19.2",
-    "babel-loader": "^8.0.6",
+    "babel-loader": "^8.1.0",
     "babel-plugin-lodash": "^3.3.4",
     "babel-plugin-preval": "^5.0.0",
     "babel-plugin-react-intl": "^3.4.1",
@@ -127,7 +127,7 @@
     "prop-types": "^15.5.10",
     "punycode": "^2.1.0",
     "@rails/ujs": "^6.0.2",
-    "react": "^16.12.0",
+    "react": "^16.13.1",
     "react-dom": "^16.13.0",
     "react-hotkeys": "^1.1.4",
     "react-immutable-proptypes": "^2.2.0",
@@ -157,13 +157,13 @@
     "sass": "^1.26.3",
     "sass-loader": "^8.0.2",
     "stacktrace-js": "^2.0.2",
-    "stringz": "^2.0.0",
+    "stringz": "^2.1.0",
     "substring-trie": "^1.0.2",
     "terser-webpack-plugin": "^2.3.5",
     "tesseract.js": "^2.0.0-alpha.16",
     "throng": "^4.0.0",
     "tiny-queue": "^0.2.1",
-    "uuid": "^3.4.0",
+    "uuid": "^7.0.2",
     "wavesurfer.js": "^3.3.1",
     "webpack": "^4.42.1",
     "webpack-assets-manifest": "^3.1.1",
@@ -174,7 +174,7 @@
   },
   "devDependencies": {
     "babel-eslint": "^10.0.3",
-    "babel-jest": "^25.1.0",
+    "babel-jest": "^25.2.4",
     "enzyme": "^3.11.0",
     "enzyme-adapter-react-16": "^1.15.2",
     "eslint": "^6.8.0",
@@ -188,6 +188,6 @@
     "react-test-renderer": "^16.13.0",
     "sass-lint": "^1.13.1",
     "webpack-dev-server": "^3.10.3",
-    "yargs": "^15.1.0"
+    "yargs": "^15.3.1"
   }
 }