Update GADM download URL

[jc-harrison]

Closes #6588

I have:

• [ ] Formatted any Python files with black
• [x] Brought the branch up to date with master
• [x] Added any relevant Github labels
• [ ] Added tests for any new additions
• [ ] Added or updated any relevant documentation
• [ ] Added an Architectural Decision Record (ADR), if appropriate
• [ ] Added an MPLv2 License Header if appropriate
• [ ] Updated the Changelog

Description

Updates download URL for GADM boundaries in FlowDB synthetic data generator.

I haven't updated to a newer GADM version, because we'd then need to update the population distributions as well, and if we're doing that we probably want to move to geoboundaries instead (#3100).

[cypress[bot]]

Passing run #22475 ↗︎

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Details:

Update GADM download URL
Project: FlowAuth	Commit: 55ea11bfaf
Status: Passed	Duration: 01:01 💡
Started: May 13, 2024 1:39 PM	Ended: May 13, 2024 1:40 PM

Review all test suite changes for PR #6589 ↗︎

[codecov[bot]]

Codecov Report

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

Project coverage is 92.30%. Comparing base (7130db3) to head (55ea11b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6589 +/- ## ========================================== - Coverage 92.31% 92.30% -0.01% ========================================== Files 268 268 Lines 10586 10586 Branches 855 855 ========================================== - Hits 9772 9771 -1 Misses 676 676 - Partials 138 139 +1 ```

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