Fix advisory search in Activity 2.1

[khlaifiabilel]

Summary

• use affects:follow-redirects to filter the Advisory Database results to advisories affecting the dependency
• update the result explanation to describe advisory vulnerability and patched-version details accurately

Fixes #126

Tests

• git diff --check
• rendered .github/steps/2-dependabot-alerts.md with the GitHub Markdown API
• verified the filtered Advisory Database URL and GitHub search-syntax documentation return HTTP 200
• confirmed the live affects:follow-redirects search returns five advisories for the npm package

UI exercise flow was not run in a temporary repository.

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This replaces #127, which closed automatically after the head fork was accidentally deleted.

[Copilot]

Pull request overview

Updates the Step 2 Dependabot lesson to make Activity 2.1’s Advisory Database search more accurate by using GitHub Advisory search syntax that filters to advisories affecting the follow-redirects package, and refreshes the explanatory text to better reflect what the advisory details represent.

Changes:

• Switches the Activity 2.1 search query to affects:follow-redirects to reduce irrelevant advisory results.
• Rewords the results explanation to focus on vulnerability details and patched versions.

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