bugdown: Update KaTeX to version 0.8.3 from 0.7.1.

Fixes #7480.

package.json

@@ -24,7 +24,7 @@
     "i18next-xhr-backend": "1.4.3",
     "jquery": "3.2.1",
     "jquery-validation": "1.16.0",
-    "katex": "0.7.1",
+    "katex": "0.8.3",
     "moment": "2.18.1",
     "moment-timezone": "0.5.13",
     "perfect-scrollbar": "0.7.1",

static/third/katex/cli.js

@@ -39,7 +39,7 @@ try {
     katex = require("/home/zulip/prod-static/min/katex.js");
 } catch (ex) {
     // Import KaTeX from node_modules (development environment) otherwise
-    katex = require("../../node_modules/katex/katex.js");
+    katex = require("../../node_modules/katex/dist/katex.js");
 }
 
 let input = "";

version.py

@@ -1,3 +1,3 @@
 ZULIP_VERSION = "1.7.1+git"
 
-PROVISION_VERSION = '12.1'
+PROVISION_VERSION = '12.2'

yarn.lock

@@ -3154,9 +3154,9 @@ jsprim@^1.2.2:
     json-schema "0.2.3"
     verror "1.3.6"
 
-katex@0.7.1:
-  version "0.7.1"
-  resolved "https://registry.yarnpkg.com/katex/-/katex-0.7.1.tgz#06bb5298efad05e1e7228035ba8e1591f3061b8f"
+katex@0.8.3:
+  version "0.8.3"
+  resolved "https://registry.yarnpkg.com/katex/-/katex-0.8.3.tgz#909d99864baf964c3ccae39c4a99a8e0fb9a1bd0"
   dependencies:
     match-at "^0.1.0"