CheckSubmodules: Run git submodule sync
#7598
Open
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This is required in case the URL of a submodule changes. Without this, if you use CheckSubmodules.cmake, submodule URL changes will cause warnings when you update, e.g. "ref ... could not be found on remote".
Note: One possible point of criticism might be that the URL changes without that the user sees it. Some might see this as a security issue, however, the submodule URLs are defined by our team - if you cannot trust our team to put valid URLs into gitmodules, you cannot trust us to write non-malicious code. So I think the fix should be fine.
@tresf Added you since it's your module, and since we discussed it in Discord a while ago.