Fix constraint error on Windows

See the warning on https://getcomposer.org/doc/articles/versions.md#caret-version-range-

Author: AlexisSerneels

.github/workflows/run-tests.yml

@@ -19,7 +19,7 @@ jobs:
         include:
           - laravel: 10.*
             testbench: 8.*
-            carbon: ^2.63
+            carbon: 2.*
 
     name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.stability }} - ${{ matrix.os }}