Type cast `$nonce` to string in `wp_verify_nonce()`.

props jesin.
fixes #29542.
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Remove the `wp_is_trusted_network()` function pending further discussion on terminology and behaviour.

See #30145

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git-svn-id: http://core.svn.wordpress.org/trunk@30567 1a063a9b-81f0-0310-95a4-ce76da25c4cd