Bump grunt from 1.4.1 to 1.5.3 in /build

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.4.1 to 1.5.3.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/main/CHANGELOG)
- [Commits](https://github.com/gruntjs/grunt/compare/v1.4.1...v1.5.3)

---
updated-dependencies:
- dependency-name: grunt
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

build/package.json

@@ -4,7 +4,7 @@
   "homepage": "http://www.onlyoffice.com",
   "private": true,
   "dependencies": {
-    "grunt": "^1.0.0",
+    "grunt": "^1.5.3",
     "grunt-contrib-clean": "^2.0.0",
     "grunt-contrib-concat": "^0.5.1",
     "grunt-contrib-copy": "^0.8.0",