LazyLoad - Update to latest version of Vanilla Lazyload

[WordPresseur]

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Describe the bug The latest version of Vanilla Lazyload is 17.8.2 and we still use the 17.5: https://github.com/wp-media/wp-rocket/blob/63f649200fa3b5b81ec83812d3448eeeea28e464/inc/Engine/Media/Lazyload/Subscriber.php#L21

Additional context Slack thread

Backlog Grooming (for WP Media dev team use only)

• [ ] Reproduce the problem
• [ ] Identify the root cause
• [ ] Scope a solution
• [ ] Estimate the effort