fix: Update to gel-sass-tools v4.1.1 (#108)

## Description
Updates the gel-sass-tools dependency to address an issue when
multiple rem values are supplied.

Author: randombitsUK

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "gel-typography",
-  "version": "6.1.0",
+  "version": "6.1.1",
   "description": "A flexible code implementation of the GEL Typography",
   "main": "_typography.scss",
   "scripts": {
@@ -41,7 +41,7 @@
     "vitest": "4.0.15"
   },
   "dependencies": {
-    "gel-sass-tools": "4.1.0",
+    "gel-sass-tools": "4.1.1",
     "sass-mq": "7.0.0"
   }
 }