Plugin not compatible with PHP 7.3

I ran a php compatibility checker on my wordpress site and the only error keeping me from upgrading to PHP 7.3 is the All-in-one migration plugin (which I used to make a backup). It returns the following errors:

FILE: <ROOT>/wp-content/plugins/all-in-one-wp-migration/lib/vendor/servmask/database/class-ai1wm-database-mysql.php
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FOUND 9 ERRORS AFFECTING 9 LINES
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39 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
49 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
58 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
67 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
76 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
86 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
96 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
106 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
116 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
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FILE: <ROOT>/wp-content/plugins/all-in-one-wp-migration/functions.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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1614 | WARNING | INI directive ‘mbstring.func_overload’ is deprecated since PHP 7.2
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Is this something the Plugin can fix and update so we can upgrade to PHP 7.3? This might be part of the issues with people using 7.3 and getting stuck at 100% or other issues. Thanks!