ci: align Julia setup and cache action pins

[hyperpolymath]

Updates julia-actions/setup-julia to v3.0.2 and julia-actions/cache to v3.1.0. Workflow-only maintenance; no runtime code changes.

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Code Review ✅ Approved

Aligns the Julia setup and cache action pins to newer versions in the CI workflow. No issues found.

Auto-approved and auto-merge armed: No blocking issues found.
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[hyperpolymath]

CI diagnosis: AcceleratorGate is an intentional direct dependency but is not registered. This follow-up adds Pkg.develop(url="https://github.com/hyperpolymath/AcceleratorGate.jl.git") before instantiate so the dependency resolves without removing tests.