PHP 8.3 Compatibility Check Report

I wanted to update my site PHP to PHP 8.3 and found some errors in the Compatibility Check Report.

Please take a look at the CSV code and fix them ASAP.

Thank you.

File,Message,Column Number,Line
wp-content/plugins/fluent-smtp/includes/libs/google-api-client/build/vendor/phpseclib/phpseclib/phpseclib/Crypt/Base.php,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,18,803
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,30,835
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,41,838
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,36,843
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,28,851
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,28,860
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,18,862
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,18,1159
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,36,1186
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,28,1191
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,18,1201
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,125,1663
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,14,1734
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,14,1735
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,18,1739
,"The constant ""MCRYPT_MODE_ECB"" is deprecated since PHP 7.1 and removed since PHP 7.2",86,1837
,"The constant ""MCRYPT_MODE_CBC"" is deprecated since PHP 7.1 and removed since PHP 7.2",122,1837
,"The constant ""MCRYPT_MODE_CFB"" is deprecated since PHP 7.1 and removed since PHP 7.2",185,1837
,"The constant ""MCRYPT_MODE_NOFB"" is deprecated since PHP 7.1 and removed since PHP 7.2",221,1837
,"The constant ""MCRYPT_MODE_OFB"" is deprecated since PHP 7.1 and removed since PHP 7.2",259,1837
,"The constant ""MCRYPT_MODE_STREAM"" is deprecated since PHP 7.1 and removed since PHP 7.2",298,1837
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,32,1838
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,32,1839
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,31,1844
,"The constant ""MCRYPT_MODE_ECB"" is deprecated since PHP 7.1 and removed since PHP 7.2",82,1844
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,14,1849

File,Message,Column Number,Line
wp-content/plugins/fluent-smtp/includes/libs/google-api-client/build/vendor/phpseclib/phpseclib/phpseclib/Crypt/Random.php,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,26,66
,Extension 'mcrypt' is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead,26,109
,"The constant ""MCRYPT_DEV_URANDOM"" is deprecated since PHP 7.1 and removed since PHP 7.2",53,109