Dave McHale

Contact Form 7 no longer supports the <code>on_sent_ok</code> and <code>on_submit</code> settings available on the Additional Settings screen as of version 5.0 of CF7. Both settings were deprecated before this release, which was why this plugin was first created. <a href="https://contactform7.com/additional-settings/" rel="nofollow ugc">https://contactform7.com/additional-settings/</a>
This plugin is meant to be a band-aid to quickly get your Additional Settings working. It reads the Additional Settings data and adds a javascript block when the form is output on the page, using DOM Events as suggested by the CF7 author. <a href="https://contactform7.com/dom-events/" rel="nofollow ugc">https://contactform7.com/dom-events/</a>

Contact Form 7: Support Deprecated Settings

Provide continued support for on_sent_ok and on_submit within Contact Form 7's Additional Settings

Ramoonus

This plugin updates <a href="http://jquery.com/" rel="nofollow ugc">jQuery</a> to the latest official stable version, which is most likely not available within the latest stable release of WordPress. 
jQuery Migrate is also included for backwards compatibility.
No files are replaced, therefore deactivation of this plugin returns your site to it`s original state.
Since WordPress 5.6 includes an up-to-date version of jQuery 3, upgrading shouldn’t`t be necessary in most cases.
Warning
If you are not familiar with beta testing, bugfixing, javascript or running bleeding edge software it`s not recommended. 
I will not provide help on JavaScript and jQuery, only on plugin related issues (PHP)!
Reporting problems
Please post bug reports and request for help on <a href="https://wordpress.org/support/plugin/jquery-updater" rel="ugc">WordPress.org Support Forums</a>.
If you run into any bugs, turning this plugin off will fully deactivate everything.
Work in Progress
<ul>
<li>Options screen to enable/disable</li>
<li>Option to choose a specific jQuery version</li>
<li>Automatic cache flushing</li>
</ul>
For more information on the development visit the plugins <a href="https://github.com/Ramoonus/jQuery-Updater/issues" rel="nofollow ugc">GitHub</a>

jQuery Updater

Simple plugin

This plugin updates jQuery to the latest stable version on your website.

Contact Form 7: Support Deprecated Settings vs jQuery Updater