Fix main build: add missing egress endpoints to harden-runner

[spoorcc]

Summary

• Add release-assets.githubusercontent.com:443 to source-provenance.yml — needed by slsa_with_provenance to download the slsa-source-corroborator binary from GitHub releases
• Add timestamp.githubapp.com:443 to source-provenance.yml, build.yml, and test.yml — needed by actions/attest and actions/attest-build-provenance when signing DSSE attestation wrappers
• Add uploads.github.com:443 to the build-whl job in build.yml — needed for artifact upload

All three endpoints were blocked by the harden-runner egress policy, cascading into build and test failures on main.

Test plan

• source-provenance workflow passes on main (both attest-source-governance and attest-source jobs)
• build workflow passes (binary and wheel jobs complete attestation steps)
• test workflow passes attestation step

https://claude.ai/code/session_01FzXNiF3f5iEnRPX3SWfd2A

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📥 Commits

Reviewing files that changed from the base of the PR and between 79444c8 and 23f8ebc.

📒 Files selected for processing (3)

• .github/workflows/build.yml
• .github/workflows/source-provenance.yml
• .github/workflows/test.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/fix-main-build-cCB7E

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