feature #4526 Replaced deprecated node-sass with sass (skmedix)

This PR was squashed before being merged into the 3.0.x-dev branch.

Discussion
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Replaced deprecated `node-sass` with `sass`

Since Bootstrap 5, recommended is to use [`sass`](https://www.npmjs.com/package/sass) library, as [`node-sass` is deprecated](https://sass-lang.com/blog/libsass-is-deprecated).

I also fixed one deprecation warning about passing value without a unit. (I can split this into a different PR if needed)

Commits
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7a46150 Replaced deprecated `node-sass` with `sass`

assets/css/easyadmin-theme/variables-bootstrap.scss

@@ -53,7 +53,7 @@ $input-bg-disabled: var(--gray-100);
 $input-color: var(--text-color-dark);
 $input-border: var(--border-color);
 $input-border-radius: var(--border-radius);
-$input-border-focus: hsla(201, 94, 37, 0.2);
+$input-border-focus: hsla(201, 94%, 37%, 0.2);
 $input-color-placeholder: var(--gray-600);
 $input-height-base: 30px;
 $form-check-input-checked-bg-color: $primary;

package.json

@@ -9,8 +9,8 @@
     "dirty-form": "^0.4.0",
     "file-loader": "^6.0.0",
     "mark.js": "^8.11.1",
-    "node-sass": "^6.0.0",
     "postcss": "^8.2.10",
+    "sass": "^1.37.2",
     "sass-loader": "^11.0.0",
     "slugify": "^1.4.0",
     "tom-select": "^1.7.3",