Fix the check_sobjects_available task to take the api_version from Cumulusci.yml

[lakshmi2506]

Fixed the issue where the check_sobjects_available takes api_version as "48.0" and lists the sobjects available as per '48' version. So, it doesn't check for the latest sobjects as per the cumulusci.yml.

Now, removing the hardcoded value automatically picks the version from cumulusci.yml

[lakshmi2506]

Hi @jkasturi-sf , since there is no API for enabling few settings, using check_sobjects_available for few validations as a part of preflight checks for reference feature. So need this fix for publishing the tile in radagast for Talent recruitment Management.

[jkasturi-sf]

Thank you for fixing this