Fix for updating existing vulnerabilities

[security-penguin]

80 and 100 are the same confidence level (1- Confirmed by other sources) but if the score is already at 100 the hardcoded 80 prevents the object being updated.

Passing the update=True is also required to update existing vulnerabilities, otherwise this connector has to create the vulnerability and won't update exisiting vulnerabilities.

Proposed changes

• Change the hardcoded 80 confidence value to 100 to ensure all existing entries can be updated.
• Added update=True so that exisiting vulnerabilities will be updated

Related issues

• Issue: Fix for CISA KEV connector doesn't update objects #3315

Checklist

• [ x] I consider the submitted work as finished
• [ x] I tested the code for its functionality using different use cases
• [x ] I added/update the relevant documentation (either on github or on notion)
• [ x] Where necessary I refactored code to improve the overall quality

Further comments