update for newer version of readr

[wibeasley]

It looks like readr stopped saving attributes as REDCapR uses it. See the bottom of the release notes for readr 1.4.0

So the files with the expected data need to be updated (see #308).

• test-column-sanitize.R
• test-constant.R
• test-create-batch-glossary.R
• test-file-oneshot.R
• test-instrument.R
• test-metadata-read.R
• test-metadata-utilities.R
• test-metadata-write.R
• test-next-free-record-name.R
• test-project.R
• test-read-batch-longitudinal.R
• test-read-batch-simple.R
• test-read-batch-survey.R
• test-read-clinical-trial.R
• test-read-errors.R
• test-read-oneshot-eav.R
• test-read-oneshot.R
• test-read-russian.R
• test-read-superwide.R
• test-retrieve-credential-local.R
• test-retrieve-credential-mssql.R
• test-sanitize.R
• test-survey-link-export-oneshot.R
• test-users-export.R
• test-utilities-collapse_vector.R
• test-utilities-replace_nas_with_explicit.R
• test-validate.R
• test-variables.R
• test-version.R
• test-write-batch.R
• test-write-oneshot.R

edit: the unchecked boxes didn't need to be updated.