tests: upgrade to phpunit 10

.gitignore

@@ -1,3 +1,3 @@
 vendor/
 composer.lock
-.phpunit.result.cache
+.phpunit.cache/

composer.json

@@ -31,7 +31,7 @@
         "laravel-json-api/neomerx-json-api": "^5.0.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5.28"
+        "phpunit/phpunit": "^10.5"
     },
     "autoload": {
         "psr-4": {

phpunit.xml

@@ -1,25 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          backupGlobals="false"
-         backupStaticAttributes="false"
-         beStrictAboutTestsThatDoNotTestAnything="false"
+         beStrictAboutTestsThatDoNotTestAnything="true"
          bootstrap="vendor/autoload.php"
          colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         convertDeprecationsToExceptions="true"
          processIsolation="false"
          stopOnError="false"
          stopOnFailure="false"
-         verbose="true"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.4/phpunit.xsd"
+         cacheDirectory=".phpunit.cache"
+         backupStaticProperties="false"
+         failOnWarning="true"
+         failOnDeprecation="true"
+         failOnNotice="true"
 >
-    <coverage>
-        <include>
-            <directory suffix=".php">src/</directory>
-        </include>
-    </coverage>
+    <coverage/>
     <testsuites>
         <testsuite name="Unit">
             <directory suffix="Test.php">./tests/Unit/</directory>
@@ -31,4 +26,9 @@
     <php>
         <ini name="error_reporting" value="E_ALL"/>
     </php>
-</phpunit>
+    <source>
+        <include>
+            <directory suffix=".php">src/</directory>
+        </include>
+    </source>
+</phpunit>

tests/Unit/Schema/SchemaFieldsTest.php

@@ -28,7 +28,7 @@ class SchemaFieldsTest extends TestCase
     /**
      * @return array
      */
-    public function includePathProvider(): array
+    public static function includePathProvider(): array
     {
         return [
             [
@@ -104,7 +104,7 @@ public function testIsRelationshipRequested(
     /**
      * @return array|array[]
      */
-    public function fieldProvider(): array
+    public static function fieldProvider(): array
     {
         return [
             [