Package.swift - bump tools version

[dflems]

Use 5.2+ to be able to use target-based dependency resolution

We should probably target something later than this even, but anything beyond 5.2 introduces some new warnings

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.16%. Comparing base (5c24a31) to head (2fafec1).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #216   +/-   ##
=======================================
  Coverage   96.16%   96.16%           
=======================================
  Files          43       43           
  Lines        1460     1460           
=======================================
  Hits         1404     1404           
  Misses         56       56           

Flag	Coverage Δ
macspm	96.16% <ø> (ø)

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