Rename fetch_graalvm_version to fetch_graalvm_release_info

[Copilot]

fetch_graalvm_version was a misleading name since the function returns (version, amd64_sha, aarch64_sha) — not just a version string.

Changes

• update.py: Renamed fetch_graalvm_version → fetch_graalvm_release_info; updated all four call sites in main()
• .gitignore: Added __pycache__/

# Before
graal17_version, graal17_amd64_sha, graal17_aarch64_sha = fetch_graalvm_version("17")

# After
graal17_version, graal17_amd64_sha, graal17_aarch64_sha = fetch_graalvm_release_info("17")

---

💬 Send tasks to Copilot coding agent from Slack and Teams to turn conversations into code. Copilot posts an update in your thread when it's finished.