SASS Dev cleanup (#7273)

# Description & Issue number it closes 
<!-- Please include a summary of the changes and the related issue.
Please also include relevant motivation and context. -->
- move to grunt-contrib-sass 
- Update imports -
https://sass-lang.com/documentation/breaking-changes/import/

## Screenshots (if appropriate)
<!-- Before and after --> 
To address the following 
```

Running "sass:dist" (sass) task
Deprecation Warning: The legacy JS API is deprecated and will be removed in Dart Sass 2.0.0.

More info: https://sass-lang.com/d/legacy-js-api

Deprecation Warning: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

More info and automated migrator: https://sass-lang.com/d/import

   ╷
29 │ @import 'scss/dropdowns';
   │         ^^^^^^^^^^^^^^^^
   ╵
    src/skin/churchcrm.scss 29:9  root stylesheet

Deprecation Warning: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

More info and automated migrator: https://sass-lang.com/d/import

   ╷
30 │ @import 'scss/forms';
   │         ^^^^^^^^^^^^
   ╵
    src/skin/churchcrm.scss 30:9  root stylesheet


```

## How to test the changes?

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update

# How Has This Been Tested?

<!-- Please describe the tests that you ran to verify your changes.
Provide instructions so we can reproduce. Please also list any relevant
details for your test configuration -->

# Checklist:

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

Gruntfile.js

@@ -22,8 +22,6 @@ module.exports = function (grunt) {
 
     var datatTablesVer = "1.10.18";
 
-    const sass = require("sass");
-
     // Project configuration.
     grunt.initConfig({
         package: grunt.file.readJSON("package.json"),
@@ -340,11 +338,6 @@ module.exports = function (grunt) {
             },
         },
         sass: {
-            options: {
-                implementation: sass,
-                sourceMap: true,
-                cacheLocation: process.env["HOME"] + "/node_cache",
-            },
             dist: {
                 files: {
                     "src/skin/churchcrm.min.css": "src/skin/churchcrm.scss",
@@ -698,7 +691,9 @@ module.exports = function (grunt) {
         //  display local master's commit hash
     });
 
-    grunt.loadNpmTasks("grunt-sass");
+    grunt.registerTask('default', ['sass']);
+
+    grunt.loadNpmTasks('grunt-contrib-sass');
     grunt.loadNpmTasks("grunt-contrib-copy");
     grunt.loadNpmTasks("grunt-contrib-clean");
     grunt.loadNpmTasks("grunt-contrib-compress");