Update gef-extras.sh

[ghostinthefingers]

Fix installation on modern Python with externally-managed environments

This patch updates the gef-extras.sh script to handle Python’s externally-managed environments (common on recent Debian/Ubuntu systems). The installer now:

1. Tries a normal pip install first.
2. Detects if the failure is due to externally-managed-environment.
3. Automatically retries with --break-system-packages if needed.
4. Exits with a clear error message for other pip failures.

without this fix, the installation fails on modern Python systems with the following error:

× This environment is externally managed
╰─> To install Python packages system-wide, try apt install ...

[github-actions]

🤖 Coverage update for 322df53 🟢

	Old	New
Commit	60a99cb	322df53
Score	71.0582%	71.0582% (0)

[Copilot]

Pull request overview

Updates the gef-extras.sh installer to handle pip installs on systems enforcing Python “externally-managed environments” (PEP 668), retrying with --break-system-packages when that specific failure is detected.

Changes:

• Capture pip install output to detect externally-managed-environment failures.
• Retry installation with --break-system-packages when that failure occurs.
• Print a clearer error message and exit for non-PEP-668 pip failures.

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