Fix failing FERC archivers

[jdangerx]

Overview

Closes #285 .

What problem does this address?

FERC archivers were failing with

TypeError: Constructor parameter should be str

Which we thought was related to some other error messages earlier about

Unsuccessful renaming of downloaded file to active file /Users/dazhong-catalyst/Library/Caches/Arelle/https/ecollection.ferc.gov/taxonomy/form60/2022-01-01/schedules/ScheduleTemporaryCashInvestments/sched-105_2022-01-01_pre.xml                             
Please remove with file manager.

But actually those errors were due to concurrency issues with arelle, and we already handled them with retries. The true issue was that aiohttp.ClientSession.get() wants a str or yarl.URL which is different from the pydantic.networks.HttpUrl that we were passing in. Oops!

What did you change in this PR?

Coerce that bad boy to a string.

Testing

How did you make sure this worked? How can a reviewer verify this?

pudl_archiver --datasets ferc60 --sandbox --only-years 2022

On main, it fails. On this branch, it succeeds. Et voilà.

[e-belfer]

Amazing, glad this wound up being a simple fix. Can we add all the FERC archivers to the run_archiver GHA and cross off two issues at once?

[e-belfer]

Exciting!