chore: use arm builds in ci

[tstirrat15]

Description

This seems to have sped things up on the SpiceDB repo so I'm trying it here. I'm also hoping it helps address the WASM flakes we're seeing.

Changes

• Use depot arm builds in workflows

Testing

Review.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.74%. Comparing base (ec981d0) to head (a778649).

Additional details and impacted files

@@ Coverage Diff @@ ## main #619 +/- ## ========================================== - Coverage 42.48% 41.74% -0.75%  ========================================== Files 38 38 Lines 5030 6128 +1098 ========================================== + Hits 2137 2558 +421  - Misses 2638 3315 +677  Partials 255 255 

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