fix(fuzz): conform to agave 3.0.3

[kprotty]

based on #942

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/runtime/program_loader.zig	83.33%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (83.33%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Files with missing lines	Coverage Δ
src/runtime/program_loader.zig	89.58% <83.33%> (-0.37%)	⬇️

... and 1 file with indirect coverage changes

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[Rexicon226]

Feel free to merge anytime, codecov doesn't need to pass to merge into zksdk PR.