fix warnings

ui/marketplace/ContractListModal.tsx

@@ -62,7 +62,7 @@ const ContractListModal = ({ onClose, type, contracts }: Props) => {
           columnGap={ type === ContractListTypes.ANALYZED ? 4 : 0 }
         >
           { displayedContracts.map((contract) => (
-            <>
+            <React.Fragment key={ contract.address }>
               { type === ContractListTypes.ANALYZED && (
                 <Box gridColumn={ 1 }>
                   <ContractSecurityReport securityReport={ contract.solidityScanReport }/>
@@ -79,7 +79,7 @@ const ContractListModal = ({ onClose, type, contracts }: Props) => {
                 gridColumn={ 2 }
                 height="32px"
               />
-            </>
+            </React.Fragment>
           )) }
         </ModalBody>
       </ModalContent>

ui/marketplace/MarketplaceListWithScores/ListItem.tsx

@@ -56,11 +56,11 @@ const ListItem = ({ app, onInfoClick, isFavorite, onFavoriteClick, isLoading, on
       rowGap={ 3 }
       py={ 3 }
       sx={{
-        ':first-child': {
+        ':first-of-type': {
           borderTop: 'none',
           paddingTop: 0,
         },
-        ':last-child': {
+        ':last-of-type': {
           borderBottom: 'none',
           paddingBottom: 0,
         },