Use specific version of testbench v8

Author: maartenpaauw

.github/workflows/run-tests.yml

@@ -20,7 +20,7 @@ jobs:
           - laravel: 9.*
             testbench: ^7.1
           - laravel: 10.*
-            testbench: ^8.0
+            testbench: ^8.0.10
 
     name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.stability }} - ${{ matrix.os }}