Renumber 4.73.2 migrations

[JordanMontgomery]

Related issue: None but cf https://fleetdm.slack.com/archives/C019WG4GH0A/p1758654375623919

No changes file

Renumbering two migrations so they can be released as part of 4.73.2

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.

• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements)

• If paths of existing endpoints are modified without backwards compatibility, checked the frontend/CLI for any necessary changes

Testing

• Added/updated automated tests

• Where appropriate, automated tests simulate multiple hosts and test for host isolation (updates to one hosts's records do not affect another)

• QA'd all new/changed functionality manually

For unreleased bug fixes in a release candidate, one of:

• Confirmed that the fix is not expected to adversely impact load test results
• Alerted the release DRI if additional load testing is needed

Database migrations

• Checked table schema to confirm autoupdate
• Checked schema for all modified table for columns that will auto-update timestamps during migration.
• Confirmed that updating the timestamps is acceptable, and will not cause unwanted side effects.
• Ensured the correct collation is explicitly set for character columns (COLLATE utf8mb4_unicode_ci).

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.08%. Comparing base (cf6343c) to head (72605ad).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...s/20250816115553_OptimizeHostScriptResultsIndex.go	66.66%	1 Missing ⚠️
...17154557_AddKernelHostCountsIndexForVulnQueries.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #33376      +/-   ##
==========================================
- Coverage   64.09%   64.08%   -0.01%     
==========================================
  Files        2061     2061              
  Lines      205162   205162              
  Branches     6735     6735              
==========================================
- Hits       131491   131485       -6     
- Misses      63304    63309       +5     
- Partials    10367    10368       +1     

Flag	Coverage Δ
backend	65.21% <66.66%> (-0.01%)	⬇️

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