fix: correct Fore.reset typo crashing update error handler

[A-S-Manoj]

Fixes #493

Problem

update_self()'s error handler uses Fore.reset (lowercase), which doesn't exist on colorama's Fore class (only Fore.RESET does). When pip install fails after pip uninstall has already succeeded, the warning meant to tell the user the tool is now uninstalled crashes instead with AttributeError: 'AnsiFore' object has no attribute 'reset', leaving them with a raw traceback and no indication of what happened.

Fix

Changed Fore.reset to Fore.RESET on the affected line.

Changes

• user_scanner/utils/update.py — one-character fix
• tests/test_update.py — added a regression test that mocks uninstall succeeding and install failing with a real subprocess.CalledProcessError, and asserts the error message prints without raising

Testing

Confirmed the new test fails on unmodified code with the exact real AttributeError, and passes with the fix. Full suite: 173 passed, 3 skipped (pre-existing, unrelated) against current main. ruff check . and mypy user_scanner both clean.

[kaifcodec]

LGTM @A-S-Manoj.
And thanks for the test update.

[A-S-Manoj]

Appreciate the quick review.