add asdf upper pin until 3.0 issues can be resolved #1005
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As described in #997 (see: #997 (comment)) there are multiple issues with the crds test suite and asdf 3.0. Additionally asdf 3.0.0 has a bug in the asdftool diff output which appears to be used by crds.
This PR adds an upper pin to asdf 3.0 until these issues can be resolved.
Alternatively, #1004 addresses the asdf 3.0 incompatibilites. It is currently blocked by asdf-format/asdf#1672 and a release of asdf 3.0.1. If other crds changes are needed adding this pin is a faster option to allow the CI to pass. However it may create issues for jwst and romancal as it would prevent them from installing asdf 3.0.