recipe_schlund20esd Remove CERES-EBAF version to fix ESGF search

[rbeucher]

Description

• See issue obs4MIPs dataset and version are outdated in recipes #2974

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[rbeucher]

@esmvalbot please run recipe_schlund20esd.yml

[esmvalbot]

Since @rbeucher asked, ESMValBot will run recipe recipe_schlund20esd.yml as soon as possible, output will be generated here

[esmvalbot]

ESMValBot is sorry to report it failed to run recipe recipe_schlund20esd.yml: exit is 1, output has been generated here