chore: remove unnecessary deepcopy()s and use sets instead of lists

[jdstrand]

No description provided.

[Copilot]

Pull request overview

This PR removes unnecessary copy.deepcopy() calls and optimizes data structures by using sets instead of lists where appropriate. The changes improve performance and code clarity without altering functionality.

Changes:

• Replaced copy.deepcopy() with shallow copies or direct references where deep copying was unnecessary
• Converted list-based URL collection to use sets for automatic duplicate handling and improved performance
• Simplified return values in collectGHAlertUrls to directly return sets instead of converting from lists

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cvelib/cve.py	Removed unnecessary deepcopy of CVE packages list and CVE object; optimized collectGHAlertUrls to use sets instead of lists for URL tracking
cvelib/common.py	Removed redundant deepcopy calls in readFile and readCve functions that were copying newly created objects

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