Configure release workflow to allow githubnext.github.io network access

[Copilot]

The release workflow generates documentation links in release highlights but couldn't access githubnext.github.io to verify paths.

Changes

• Added githubnext.github.io to the network.allowed array in .github/workflows/release.md
• Recompiled workflow to propagate the network configuration to release.lock.yml

The workflow prompt instructs the agent to create documentation links like:

- User docs: `https://githubnext.github.io/gh-aw/`
- Reference: `https://githubnext.github.io/gh-aw/reference/`

Network access enables the agent to verify these paths exist before linking.

Original prompt

Configure the release.md agentic workflow such that network has githubnext.github.io as an allowed domain.

Custom agent used: create-agentic-workflow
Design agentic workflows using GitHub Agentic Workflows (gh-aw) extension with interactive guidance on triggers, tools, and security best practices.

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