dependencies: Upgrade JavaScript dependencies.

css-loader@^4 is also available, but we can’t use it yet because of
https://github.com/webpack-contrib/css-loader/issues/1164.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

package.json

@@ -43,7 +43,7 @@
     "js-yaml": "^3.13.1",
     "katex": "^0.12.0",
     "lodash": "^4.17.19",
-    "mini-css-extract-plugin": "^0.9.0",
+    "mini-css-extract-plugin": "^0.10.0",
     "moment": "^2.24.0",
     "moment-timezone": "^0.5.25",
     "openapi-examples-validator": "^4.0.0",
@@ -66,7 +66,7 @@
     "spectrum-colorpicker": "^1.8.1",
     "stacktrace-gps": "^3.0.4",
     "style-loader": "^1.0.0",
-    "terser-webpack-plugin": "^3.0.3",
+    "terser-webpack-plugin": "^4.1.0",
     "turndown": "^6.0.0",
     "unorm": "^1.6.0",
     "webfonts-loader": "^5.0.0",
@@ -83,7 +83,7 @@
     "@types/mini-css-extract-plugin": "^0.9.0",
     "@types/node": "^14.0.11",
     "@types/optimize-css-assets-webpack-plugin": "^5.0.1",
-    "@types/terser-webpack-plugin": "^3.0.0",
+    "@types/terser-webpack-plugin": "^4.1.0",
     "@types/webpack": "^4.4.32",
     "@types/webpack-dev-server": "^3.1.6",
     "@typescript-eslint/eslint-plugin": "^3.1.0",

version.py

@@ -44,4 +44,4 @@ API_FEATURE_LEVEL = 30
 #   historical commits sharing the same major version, in which case a
 #   minor version bump suffices.
 
-PROVISION_VERSION = '97.1'
+PROVISION_VERSION = '97.2'