fix(question-bank): correct q326 VPC typo

[terminalchai]

What does this PR do?

Corrects the q326 answer text from Amazon VP to Amazon VPC and refreshes the question-bank metadata hash.

Why?

The truncated service name makes the answer inaccurate and confusing for learners.

Closes #244

How was this tested?

• npm run validate
• npm run check (Astro check, ESLint, and 318 Vitest tests)
• npm run build
• npm run e2e (109 passed, 20 expected credential-gated skips)
• git diff --check

Checklist

• npm run build passes locally
• npm run lint passes locally
• npm run test passes locally
• npm run validate passes locally (only if you touched src/data/**/*.json)
• No new third-party dependencies (or justified above)

Screenshots (UI changes only)

Not applicable; this is a question-bank text correction.