Fix a case where wp_rand is undefined. #63352

Job	Run time
detect changed files	10s
Changelogger use	33s
Changelogger validity	32s
Copied files are in sync	8s
Project structure	2m 45s
PHP lint (7.0)	43s
PHP lint (7.2)	34s
PHP lint (7.4)	43s
PHP Compatibility	1m 16s
PHP lint (8.0)	42s
PHP Code Sniffer (non-excluded files only)	2m 18s
PHP lint (8.1)	56s
PHP lint (8.2)	59s
PHP lint (8.3)	46s
Check linter exclude lists	0s
ESLint (changes to excluded files only)	0s
ESLint (non-excluded files only)	0s
Lint GitHub Actions yaml files	0s
PHP Code Sniffer (changes to excluded files only)	0s
Lock files are up to date	0s
Monorepo package version refs	0s
	13m 5s

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