Update delay JS script

[MathieuLamiot]

Description

• Fix for https://github.com/wp-media/delay-javascript-loading/issues/142 where jQuery.ready() should be asynchronous since jQuery v3

Type of change

• Chore

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -0.10%)	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (5b018e4)	38787	17157	44.23%
Head commit (4300743)	38787 (+0)	17157 (+0)	44.23% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#7273)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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_{Codacy stopped sending the deprecated coverage status on June 5th, 2024. Learn more}

[Mai-Saad]

Working as expected notice that failed tests are already failing on trunk
testrail-report-694.pdf

• integrity attribute is removed even on 1.2.6
  https://wp-media.slack.com/archives/CUT7FLHF1/p1738657607011159