PHP 8.3 Warnings on Vendor Libraries with TB 1.6

[Rhapsody]

The following are captured in the error log so they may be investigated for future updates:

Two Smarty errors:

PHP Deprecated:  Using php-function "stripos" as a modifier is deprecated and will be removed in a future release. Use Smarty::registerPlugin to explicitly register a custom modifier. in .../shop/vendor/smarty/smarty/libs/sysplugins/smarty_internal_compile_private_modifier.php on line 112

PHP Deprecated:  Using php-function "strstr" as a modifier is deprecated and will be removed in a future release. Use Smarty::registerPlugin to explicitly register a custom modifier. in .../shop/vendor/smarty/smarty/libs/sysplugins/smarty_internal_compile_private_modifier.php on line 112

TCPDF errors:

PHP Warning:  Undefined array key "thead" in .../shop/vendor/tecnickcom/tcpdf/tcpdf.php on line 16679
PHP Warning:  Undefined array key "trids" in .../shop/vendor/tecnickcom/tcpdf/tcpdf.php on line 19746
PHP Warning:  foreach() argument must be of type array|object, null given in .../shop/vendor/tecnickcom/tcpdf/tcpdf.php on line 19746
PHP Warning:  Undefined array key "trids" in .../shop/vendor/tecnickcom/tcpdf/tcpdf.php on line 19778
PHP Warning:  foreach() argument must be of type array|object, null given in .../shop/vendor/tecnickcom/tcpdf/tcpdf.php on line 19778