refactor(react-router): replace substr with substring (#12080)

* Replaced deprecated subtr method with substring in history package

* Update .changeset/silver-cats-shave.md

---------

Co-authored-by: Michaël De Boey <[email protected]>

Author: bilalk711

.changeset/silver-cats-shave.md

@@ -0,0 +1,5 @@
+---
+"react-router": patch
+---
+
+Replace `substr` with `substring`

packages/react-router/lib/router/history.ts

@@ -424,7 +424,7 @@ export function createHashHistory(
       pathname = "/",
       search = "",
       hash = "",
-    } = parsePath(window.location.hash.substr(1));
+    } = parsePath(window.location.hash.substring(1));
 
     // Hash URL should always have a leading / just like window.location.pathname
     // does, so if an app ends up at a route like /#something then we add a
@@ -510,7 +510,7 @@ export function warning(cond: any, message: string) {
 }
 
 function createKey() {
-  return Math.random().toString(36).substr(2, 8);
+  return Math.random().toString(36).substring(2, 10);
 }
 
 /**
@@ -576,14 +576,14 @@ export function parsePath(path: string): Partial<Path> {
   if (path) {
     let hashIndex = path.indexOf("#");
     if (hashIndex >= 0) {
-      parsedPath.hash = path.substr(hashIndex);
-      path = path.substr(0, hashIndex);
+      parsedPath.hash = path.substring(hashIndex);
+      path = path.substring(0, hashIndex);
     }
 
     let searchIndex = path.indexOf("?");
     if (searchIndex >= 0) {
-      parsedPath.search = path.substr(searchIndex);
-      path = path.substr(0, searchIndex);
+      parsedPath.search = path.substring(searchIndex);
+      path = path.substring(0, searchIndex);
     }
 
     if (path) {