PHP 8.1 update

Hi everyone.

We want to keep our site secure we do that by updating the PHP. We want to update our sites to 8.1 but it gives an error message on this plugin. Our programmer indicates the following: It is important that the Deprecated messages below be resolved first by plugin and theme developers.

Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in?/home/magneig77/domains/magnetarvismagneet.nl/public_html/wp-content/plugins/mollie-payments-for-woocommerce/src/Log/WcPsrLoggerAdapter.php?on line?83

Deprecated: Using ${var} in strings is deprecated, use {$var} instead in?/home/magneig77/domains/magnetarvismagneet.nl/public_html/wp-content/themes/trader-child/inc/modules/cross-sellers/actions.php?on line?41

Deprecated: Return type of Meta_Tag_Manager\Notices::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in?/home/magneig77/domains/magnetarvismagneet.nl/public_html/wp-content/plugins/meta-tag-manager/admin/notices/notices.php?on line?243

Deprecated: Return type of Meta_Tag_Manager\Notices::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in?/home/magneig77/domains/magnetarvismagneet.nl/public_html/wp-content/plugins/meta-tag-manager/admin/notices/notices.php?on line?251

Deprecated: Return type of Meta_Tag_Manager\Notices::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in?/home/magneig77/domains/magnetarvismagneet.nl/public_html/wp-content/plugins/meta-tag-manager/admin/notices/notices.php?on line?247

Deprecated: Return type of Meta_Tag_Manager\Notices::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in?/home/magneig77/domains/magnetarvismagneet.nl/public_html/wp-content/plugins/meta-tag-manager/admin/notices/notices.php?on line?255

Deprecated: Return type of Meta_Tag_Manager\Notices::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in?/home/magneig77/domains/magnetarvismagneet.nl/public_html/wp-content/plugins/meta-tag-manager/admin/notices/notices.php?on line?240

Deprecated: Return type of Meta_Tag_Manager\Notices::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in?/home/magneig77/domains/magnetarvismagneet.nl/public_html/wp-content/plugins/meta-tag-manager/admin/notices/notices.php?on line?229

We look forward to any assistance