Remove unused `# type: ignore`

resolves #753

[x] I have read the contributing guide and understand what's expected of me
[x] I have signed the CLA
[x] I have run this code in development and it appears to resolve the stated issue
[x] This PR includes tests, or tests are not required/relevant for this PR
[x] I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
[x] I have run changie new to create a changelog entry

dbt-labs / dbt-spark