Merge pull request #15898 from backstage/freben/substr

🧹  get rid of usages of substr which is deprecated

packages/core-components/src/components/Avatar/utils.ts

@@ -22,11 +22,11 @@ export function stringToColor(str: string) {
   let color = '#';
   for (let i = 0; i < 3; i++) {
     const value = (hash >> (i * 8)) & 0xff;
-    color += `00${value.toString(16)}`.substr(-2);
+    color += `00${value.toString(16)}`.slice(-2);
   }
   return color;
 }
 
 export function extractInitials(value: string) {
-  return value.match(/\b\w/g)?.join('').substring(0, 2);
+  return value.match(/\b\w/g)?.join('').slice(0, 2);
 }