Fixes warning while reading integration config for PHP 8+ #5659

Job	Run time
WP 5.8.x, multisite: no, JP: yes, PHP: 7.4	10m 20s
WP 5.9.x, multisite: no, JP: yes, PHP: 7.4	10m 31s
WP 6.0.x, multisite: no, JP: yes, PHP: 7.4	9m 48s
WP 6.1.x, multisite: no, JP: yes, PHP: 7.4	8m 51s
WP latest, multisite: no, JP: yes, PHP: 7.4	8m 51s
WP nightly, multisite: no, JP: yes, PHP: 7.4	10m 30s
WP latest, multisite: yes, JP: yes, PHP: 7.4	11m 23s
WP nightly, multisite: yes, JP: yes, PHP: 7.4	9m 8s
WP latest, multisite: no, JP: no, PHP: 7.4	7m 34s
WP latest, multisite: yes, JP: no, PHP: 7.4	8m 55s
WP 6.2.x, multisite: no, JP: yes, PHP: 8.0	10m 8s
WP 6.2.x, multisite: yes, JP: yes, PHP: 8.0	11m 34s
WP latest, multisite: no, JP: yes, PHP: 8.0	12m 36s
WP latest, multisite: yes, JP: yes, PHP: 8.0	13m 41s
WP nightly, multisite: no, JP: yes, PHP: 8.0	8m 39s
WP nightly, multisite: yes, JP: yes, PHP: 8.0	8m 50s
WP latest, multisite: no, JP: yes, PHP: 8.1	9m 3s
WP latest, multisite: yes, JP: yes, PHP: 8.1	10m 28s
WP nightly, multisite: no, JP: yes, PHP: 8.2	8m 25s
WP nightly, multisite: yes, JP: yes, PHP: 8.2	10m 12s
WP nightly, multisite: no, JP: yes, PHP: 8.3	10m 58s
WP nightly, multisite: yes, JP: yes, PHP: 8.3	10m 10s
	3h 40m 35s

Provide feedback