Test hologram#51 (remove top pin for jsonschema)

[jtcohen6]

resolves #6775

Description

Run tests in CI with dbt-labs/hologram#51 (no jsonschema pin)

$ pip install --upgrade jsonschema -r dev-requirements.txt -r editable-requirements.txt
...
$ pip freeze | grep 'hologram'
hologram @ git+https://github.com/dbt-labs/hologram.git@e4f5741c544b58e028f35296b09b3c7cdd40c4a7
$ pip freeze | grep 'jsonschema'
jsonschema==4.17.3

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry - have added label for now, will do this if the PR passes CI

[jtcohen6]

Can confirm that in CI I'm seeing:

hologram @ git+https://github.com/dbt-labs/hologram.git@e4f5741c544b58e028f35296b09b3c7cdd40c4a7
jsonschema==4.17.3