feat: GET /repos/{owner}/{repo}/secret-scanning/alerts, GET /repos/{owner}/{repo}/secret-scanning/alerts/{alert_number} (#15)

BREAKING CHANGE: `components/schemas/code-scanning-alert-number` renamed to `components/schemas/alert-number`

BREAKING CHANGE: `components/schemas/code-scanning-alert-created-at` renamed to `components/schemas/alert-created-at`

BREAKING CHANGE: `components/schemas/code-scanning-alert-url` renamed to `components/schemas/alert-url`

BREAKING CHANGE: `components/schemas/code-scanning-alert-html-url` renamed to `components/schemas/alert-html-url`

Author: octokitbot