Feat: Update the underscore js to 1.13.7

[hbhalodia]

Trac ticket: https://core.trac.wordpress.org/ticket/61836

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[github-actions]

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Props hbhalodia, peterwilsoncc, aristath, desrosj.

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[github-actions]

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[desrosj]

Thanks @hbhalodia! Could you also update wp-includes/script-loader.php to indicate the correct version for the scripts->add( 'underscore' ); call?

[hbhalodia]

Sure, I would update the PR.

[hbhalodia]

Hi @desrosj, This is now updated. Thank You,

[peterwilsoncc]

Merged r58880 / faf75b7