chore: reorder imports to comply with the CS check (#9398)

Author: Hectorhammett

Spanner/src/Database.php

@@ -53,9 +53,9 @@
 use Google\Cloud\Spanner\V1\Client\SpannerClient;
 use Google\Cloud\Spanner\V1\ExecuteSqlRequest;
 use Google\Cloud\Spanner\V1\Mutation;
-use Google\Cloud\Spanner\V1\ReadRequest;
 use Google\Cloud\Spanner\V1\Mutation\Delete;
 use Google\Cloud\Spanner\V1\Mutation\Write;
+use Google\Cloud\Spanner\V1\ReadRequest;
 use Google\Cloud\Spanner\V1\TransactionOptions\IsolationLevel;
 use Google\Cloud\Spanner\V1\TransactionOptions\ReadWrite\ReadLockMode;
 use Google\Cloud\Spanner\V1\TypeCode;

Spanner/src/Transaction.php

@@ -492,10 +492,7 @@ public function commit(array $options = []): Timestamp
         if ($this->precommitToken) {
             $commitOptions['precommitToken'] = $this->precommitToken;
         }
-        if (isset($commitOptions['requestOptions'])
-            && is_array($commitOptions['requestOptions'])
-            && isset($commitOptions['requestOptions']['requestTag'])
-        ) {
+        if (isset($commitOptions['requestOptions'])) {
             unset($commitOptions['requestOptions']['requestTag']);
             if (0 === count($commitOptions['requestOptions'])) {
                 unset($commitOptions['requestOptions']);