Replace siuba in Reports Site

[KatrinaMKaiser]

Background

As a codeowner of Reports, I want to remove siuba so that it doesn't hold back upgrading other dependencies.

Acceptance criteria

• siuba is removed from reports code and replaced with sqlalchemy and/or pandas where applicable

[raebot]

Check in with @vevetron before starting this.

[vevetron]

@raebot Don't need to check with me. Anyone can do this.

[vevetron]

Here is an example PR of removing siuba:
https://github.com/cal-itp/reports/pull/305/files