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

Conflicts:
- `config/webpack/shared.js`:
  Upstream has changed how Tesseract.js gets included and dropped a dependency.
  The conflict is caused by glitch-soc having different code due to its
  theming system.
  Ported upstream changes.
- `lib/mastodon/version.rb`:
  Upstream refactor/code style change in a place we replaced upstream's
  repo URL with ours.
  Ported upstram changes, keeping our repo URL.
- `yarn.lock`:
  Upstream dropped dependencies, one of which was textually too close to
  a glitch-soc-specific dependency. Not a real conflict.

package.json

@@ -86,7 +86,6 @@
     "blurhash": "^1.1.3",
     "classnames": "^2.2.5",
     "compression-webpack-plugin": "^5.0.1",
-    "copy-webpack-plugin": "^6.0.3",
     "cross-env": "^7.0.2",
     "css-loader": "^4.2.2",
     "cssnano": "^4.1.10",
@@ -114,7 +113,7 @@
     "lodash": "^4.17.19",
     "mark-loader": "^0.1.6",
     "marky": "^1.2.1",
-    "mini-css-extract-plugin": "^0.9.0",
+    "mini-css-extract-plugin": "^0.11.0",
     "mkdirp": "^1.0.4",
     "npmlog": "^4.1.2",
     "object-assign": "^4.1.1",
@@ -162,7 +161,7 @@
     "stringz": "^2.1.0",
     "substring-trie": "^1.0.2",
     "terser-webpack-plugin": "^3.0.6",
-    "tesseract.js": "2.0.0-alpha.16",
+    "tesseract.js": "^2.1.1",
     "throng": "^4.0.0",
     "tiny-queue": "^0.2.1",
     "uuid": "^8.2.0",
@@ -174,7 +173,7 @@
     "wicg-inert": "^3.0.3"
   },
   "devDependencies": {
-    "@testing-library/jest-dom": "^5.11.2",
+    "@testing-library/jest-dom": "^5.11.4",
     "@testing-library/react": "^10.4.7",
     "babel-eslint": "^10.1.0",
     "babel-jest": "^26.3.0",