Are you overriding templates?
Not sure? Most times you would know if you are overriding templates, because it takes some coding and file-manipulation. If someone might have done this for you, you would find files in your (child) theme woocommerce/wcgwp/ folder. If that folder is empty, you can stop reading; no action necessary!
In most cases, your old templates will continue to work*. If you have outdated templates in your (child) theme woocommerce/wcgwp/ folder, those will be read, and their dependency templates loaded as well. But since this is not optimal, it’s highly recommended you move your template changes over to the updated (or in some cases, replacement) template. Clues to what happened to your template will be in the header of the updated (in the woocommerce-gift-wrapper-plus/templates/wcgwp/ folder) template file. If the header says the template is DEPRECATED, that means it is not used anymore and it will do no good to override it. If the header says a new template is being used, copy that new template to your (child) theme woocommerce/wcgwp/ and re-create your template changes in that new file.
*They will work for an indeterminate length of time. At some point in the future they may be removed, so it’s best to look at updating your template overrides sooner than later.