use newer PHP array syntax

templates/other/accounts.php.tt2

 <?php
 // PhP configuration file loaded in simpleSamlPhp authsources.php file
-$validTestAccounts = array (
+$validTestAccounts = [
     'authcrypt:Hash',
 
 [% FOREACH account IN accounts %]
     [% template = account.profile() _ '.tt2' %]
     [% PROCESS $template scope=account.scope() id=account.id() | trim %]
-    '[% account.internal_uid() %]:{SHA256}[% account.password_hash() %]=' => array(
-        'internal_uid' => array([% account.internal_uid().quote %]),
-        'associatedSP' => array([% account.entityid().quote %]),
+    '[% account.internal_uid() %]:[% account.password_hash() %]' => [
+        'internal_uid' => [[% account.internal_uid().quote %]],
+        'associatedSP' => [[% account.entityid().quote %]],
     [% FOREACH pair IN attributes.pairs %]
-        '[% pair.key %]' => array([% pair.value.quote("'").join(', ') %]),
+        '[% pair.key %]' => [[% pair.value.quote("'").join(', ') %]],
     [% END %]
-    ),
+    ],
 
 [% END %]
-);
+];