fix: improve release workflow reliability

[jonathannorris]

Summary

• Fix prerelease input incorrectly wired to draft flag in the Create Release step
• Fix release target SHA pointing to the pre-bump commit instead of the pushed commit
• Upgrade actions/setup-node from v3 to v4
• Use git pull --ff-only instead of git pull to avoid merge commits

These same fixes were applied to feature-flag-pr-insights-action in DevCycleHQ/feature-flag-pr-insights-action#125.

[Copilot]

Pull request overview

Improves the GitHub Actions release workflow so releases are created with the correct prerelease/draft flags and target commit, while also modernizing and hardening the workflow’s git/node setup.

Changes:

• Corrects prerelease wiring in the Create Release step and uses the pushed commit SHA as the release target.
• Upgrades actions/setup-node from v3 to v4.
• Replaces git pull with git pull --ff-only to avoid merge commits during the release push.

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