minor #44167 [DependencyInjection][FrameworkBundle] Leverage array_is_list (jderusse)

This PR was merged into the 5.4 branch.

Discussion
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[DependencyInjection][FrameworkBundle] Leverage array_is_list

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Use `array_is_list` instead of `count`+`range`+`array_key`

take over #44156

Commits
-------

4bd5c8b135 Leverage array_is_list

Author: fabpot

DependencyInjection/Configuration.php

@@ -343,7 +343,7 @@ private function addWorkflowSection(ArrayNodeDefinition $rootNode)
                                     $workflows = [];
                                 }
 
-                                if (1 === \count($workflows) && isset($workflows['workflows']) && array_keys($workflows['workflows']) !== range(0, \count($workflows) - 1) && !empty(array_diff(array_keys($workflows['workflows']), ['audit_trail', 'type', 'marking_store', 'supports', 'support_strategy', 'initial_marking', 'places', 'transitions']))) {
+                                if (1 === \count($workflows) && isset($workflows['workflows']) && !array_is_list($workflows['workflows']) && !empty(array_diff(array_keys($workflows['workflows']), ['audit_trail', 'type', 'marking_store', 'supports', 'support_strategy', 'initial_marking', 'places', 'transitions']))) {
                                     $workflows = $workflows['workflows'];
                                 }
 
@@ -1280,7 +1280,7 @@ private function addLockSection(ArrayNodeDefinition $rootNode, callable $enableI
                                 ->ifString()->then(function ($v) { return ['default' => $v]; })
                             ->end()
                             ->beforeNormalization()
-                                ->ifTrue(function ($v) { return \is_array($v) && array_keys($v) === range(0, \count($v) - 1); })
+                                ->ifTrue(function ($v) { return \is_array($v) && array_is_list($v); })
                                 ->then(function ($v) {
                                     $resources = [];
                                     foreach ($v as $resource) {

composer.json

@@ -28,6 +28,7 @@
         "symfony/http-kernel": "^5.4|^6.0",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/polyfill-php80": "^1.16",
+        "symfony/polyfill-php81": "^1.22",
         "symfony/filesystem": "^4.4|^5.0|^6.0",
         "symfony/finder": "^4.4|^5.0|^6.0",
         "symfony/routing": "^5.3|^6.0"