TST: Change SDSS URLs to HTTPS

[pllim]

Fix #1135 as @weaverba137 suggested (thanks!).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.82%. Comparing base (5ec4931) to head (26e390d). Report is 8 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1136 +/- ## =========================================== + Coverage 72.22% 86.82% +14.60% =========================================== Files 62 63 +1 Lines 4432 4525 +93 =========================================== + Hits 3201 3929 +728 + Misses 1231 596 -635 ```

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[pllim]

All green! I don't think this needs a review. Merging.

[rosteen]

I retroactively approve, thanks!