Guzzle lib needs updating to support PHP 8.0 and hgher.

[rikardow]

Hi, thanks for the great work on this plugin

We found some errors and deprecations in the codebase, here's the list

1. File: admin/tool/trigger/guzzle/GuzzleHttp/Promise/functions.php
   Line: 222
   Message: Function each() is deprecated since PHP 7.2 and removed since PHP 8.0; Use a foreach loop or ArrayIterator instead
   Type: error

2. File: admin/tool/trigger/guzzle/GuzzleHttp/Promise/functions.php
   Line: 257
   Message: Function each() is deprecated since PHP 7.2 and removed since PHP 8.0; Use a foreach loop or ArrayIterator instead
   Type: error

3. File: admin/tool/trigger/guzzle/GuzzleHttp/Promise/functions.php
   Line: 313
   Message: Function each() is deprecated since PHP 7.2 and removed since PHP 8.0; Use a foreach loop or ArrayIterator instead
   Type: error

4. File: admin/tool/trigger/edit.php
   Line: 74
   Message: Using ${var} in strings is deprecated since PHP 8.2, use {$var} instead. Found: ${pluginname}
   Type: warning

5. File: admin/tool/trigger/edit.php
   Line: 74
   Message: Using ${var} in strings is deprecated since PHP 8.2, use {$var} instead. Found: ${eventname}
   Type: warning

Thank you very much for your efforts