Fix tests for MongoDB 7.0

Error message have changed

Caused by :: Write conflict during plan execution and yielding is disabled. :: Please retry your operation or multi-document transaction.

Author: GromNaN

.github/workflows/build-ci.yml

@@ -40,6 +40,8 @@ jobs:
                     - '4.2'
                     - '4.4'
                     - '5.0'
+                    - '6.0'
+                    - '7.0'
                 php:
                     - '8.1'
                     - '8.2'

tests/TransactionTest.php

@@ -384,7 +384,6 @@ public function testTransactionRespectsRepetitionLimit(): void
             $this->fail('Expected exception during transaction');
         } catch (BulkWriteException $e) {
             $this->assertInstanceOf(BulkWriteException::class, $e);
-            $this->assertStringContainsString('WriteConflict', $e->getMessage());
         }
 
         $this->assertSame(2, $timesRun);