chore: address security alerts on braces escape and KaTeX (#3301)

web/app/components/base/prompt-editor/plugins/variable-value-block/index.tsx

     if (matchArr === null)
       return null
 
-    const hashtagLength = matchArr[3].length + 4
+    const hashtagLength = matchArr[0].length
     const startOffset = matchArr.index
     const endOffset = startOffset + hashtagLength
     return {

web/app/components/base/prompt-editor/plugins/variable-value-block/utils.ts

 export function getHashtagRegexString(): string {
-  const hashtag = '(\{)(\{)([a-zA-Z_][a-zA-Z0-9_]{0,29})(\})(\})'
+  const hashtag = '\\{\\{[a-zA-Z_][a-zA-Z0-9_]{0,29}\\}\\}'
 
   return hashtag
 }

web/package.json

     "immer": "^9.0.19",
     "js-audio-recorder": "^1.0.7",
     "js-cookie": "^3.0.1",
-    "katex": "^0.16.7",
+    "katex": "^0.16.10",
     "lamejs": "^1.2.1",
     "lexical": "^0.12.2",
     "lodash-es": "^4.17.21",

web/yarn.lock

     object.assign "^4.1.4"
     object.values "^1.1.6"
 
-katex@^0.16.0, katex@^0.16.7:
+katex@^0.16.0:
   version "0.16.8"
   resolved "https://registry.npmjs.org/katex/-/katex-0.16.8.tgz"
   integrity sha512-ftuDnJbcbOckGY11OO+zg3OofESlbR5DRl2cmN8HeWeeFIV7wTXvAOx8kEjZjobhA+9wh2fbKeO6cdcA9Mnovg==
   dependencies:
     commander "^8.3.0"
 
+katex@^0.16.10:
+  version "0.16.10"
+  resolved "https://registry.yarnpkg.com/katex/-/katex-0.16.10.tgz#6f81b71ac37ff4ec7556861160f53bc5f058b185"
+  integrity sha512-ZiqaC04tp2O5utMsl2TEZTXxa6WSC4yo0fv5ML++D3QZv/vx2Mct0mTlRx3O+uUkjfuAgOkzsCmq5MiUEsDDdA==
+  dependencies:
+    commander "^8.3.0"
+
 khroma@^2.0.0:
   version "2.0.0"
   resolved "https://registry.npmjs.org/khroma/-/khroma-2.0.0.tgz"