Handle cart version missmatch

[filipsobol]

Short Description and Why It's Useful

This PR adds support for detecting if the cart update failed due to a version mismatch. If so, request will be resent with the updated version number.

Which Environment This Relates To

• Test version (https://test.storefrontcloud.io) - this is a new feature or improvement for Vue Storefront. I've created branch from develop branch and want to merge it back to develop
• RC version (https://next.storefrontcloud.io) - this is a stabilisation fix for Release Candidate of Vue Storefront. I've created branch from release branch and want to merge it back to release
• Stable version (https://demo.storefrontcloud.io) - this is an important fix for current stable version. I've created branch from hotfix or master branch and want to merge it back to hotfix

Upgrade Notes and Changelog

• No upgrade steps required (100% backward compatibility and no breaking changes)
• I've updated the Upgrade notes and Changelog on how to port existing Vue Storefront sites with this new feature

┆Issue is synchronized with this Jira Story by Unito

[github-actions]

💙 vsf-next-demo successfully deployed at https://462b83e99ef793498bdfbf9b3b9309d8005e2f61.vsf-next-demo.preview.storefrontcloud.io