Summary: Bun launches v1.3.9 with parallel script running

Why It Matters: This update helps developers run multiple tasks at once and improves how the tool handles memory and code speed.

What Changed:

• Updated the version from v1.3.8 to v1.3.9.
• Added a new feature to run scripts in parallel or sequential order.
• Added support for Symbol.dispose in mocks and spies within the test runner.
• Introduced ESM bytecode compilation for faster execution.
• Improved the speed of the built-in Markdown parser.