Perform the following in the Azure Console:

1. Go to Storage Accounts
2. For each storage account, go to Shared access signature
3. Set Allowed protocols to HTTPS only

Please note that at this point of time, there is no API/CLI mechanism available to
programmatically conduct security assessment for this recommendation.

References:

1. https://docs.microsoft.com/en-us/rest/api/storageservices/delegating-access-with-a-shared-access-signature