You can disable the update of a particular or all WordPress plug-ins in several ways, I’ll describe several of them:
1) Disable the update of a particular plug-in by changing its version in the code, for example to 99.9, but do not forget to comment out its real version in case you need to update.
2) To disable updates to all plug-ins, add the following line to the wp-config.php configuration file:
define( 'DISALLOW_FILE_MODS', true );
To completely disable all updates:
define( 'AUTOMATIC_UPDATER_DISABLED', true );
3) Also, you can disable all updates by installing a special plug-in, for example Disable All WordPress Updates or Update Control and others.
I note that it is not advisable to disable the update of all plugins, as vulnerabilities can be fixed with updates.
See also my article:
How to Prevent WordPress Theme Updates