I made below in my theme, but new xml does not remove the git option block.
/app/design/frontend/Mytheme/themename/Magento_GiftMessage/Magento_GiftMessage/view/frontend/layout/checkout_cart_item_renderers.xml
and
/app/design/frontend/Mytheme/themename/Magento_GiftMessage/Magento_GiftMessage/view/frontend/layout/checkout_cart_index.xml
the xml is:
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceBlock name="checkout.cart.order.actions.gift_options" remove="true"/>
</body>
</page>