Update lazyload library

[jeawhanlee]

Description

Bump the lazyload library to version 3.0.18.

Type of change

• Bug fix (non-breaking change which fixes an issue).
• Enhancement (non-breaking change which improves an existing functionality).

Detailed scenario

What was tested

Refer here

How to test

Refer here

Technical description

Documentation

Port changes from the rocket lazyload library: wp-media/rocket-lazyload-common#127

New dependencies

Rocket lazyload library

Risks

N/A

Mandatory Checklist

Code validation

• I validated all the Acceptance Criteria. If possible, provide screenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I implemented built-in tests to cover the new/changed code.

Code style

• I wrote a self-explanatory code about what it does.
• I protected entry points against unexpected inputs.
• I did not introduce unnecessary complexity.
• Output messages (errors, notices, logs) are explicit enough for users to understand the issue and are actionnable.

Unticked items justification

Not applicable to the changes in this PR.

Additional Checks

• In the case of complex code, I wrote comments to explain it.
• When possible, I prepared ways to observe the implemented system (logs, data, etc.).
• I added error handling logic when using functions that could throw errors (HTTP/API request, filesystem, etc.)

[wordpressfan]

@wp-media/qa-team we need to release this before 20th of Oct.
Thanks.