Bump grunt from 1.5.2 to 1.5.3 in /app/static/minder

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.5.2 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/v1.5.2...v1.5.3)

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

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

app/static/minder/package-lock.json

@@ -177,7 +177,7 @@
     "array-each": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
-      "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
+      "integrity": "sha512-zHjL5SZa68hkKHBFBK6DJCTtr9sfTCPCaph/L7tMSLcTFgy+zX7E+6q5UArbtOtMBCtxdICpfTCspRse+ywyXA==",
       "dev": true
     },
     "array-find-index": {
@@ -1685,9 +1685,9 @@
       "dev": true
     },
     "grunt": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.2.tgz",
-      "integrity": "sha512-XCtfaIu72OyDqK24MjWiGC9SwlkuhkS1mrULr1xzuJ2XqAFhP3ZAchZGHJeSCY6mkaOXU4F7SbmmCF7xIVoC9w==",
+      "version": "1.5.3",
+      "resolved": "https://registry.npmjs.org/grunt/-/grunt-1.5.3.tgz",
+      "integrity": "sha512-mKwmo4X2d8/4c/BmcOETHek675uOqw0RuA/zy12jaspWqvTp4+ZeQF1W+OTpcbncnaBsfbQJ6l0l4j+Sn/GmaQ==",
       "dev": true,
       "requires": {
         "dateformat": "~3.0.3",