Bump @linearb/gitstream-core to 2.1.280 - #533

describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Update @linearb/gitstream-core to version 2.1.280 and bump multiple development dependencies to latest versions.

Main changes:

• Upgraded @linearb/gitstream-core from 2.1.278 to 2.1.280 in dependencies
• Updated devDependencies including Jest (30.4.2), TypeScript (6.0.3), ESLint (10.3.0), and related tooling packages

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