ci: install `svn` before running tests #8781

Job	Run time
WP 6.1.x, multisite: no, JP: yes, PHP: 8.1	1m 31s
WP 6.1.x, multisite: yes, JP: yes, PHP: 8.1	1m 32s
WP 6.2.x, multisite: no, JP: yes, PHP: 8.1	1m 31s
WP 6.2.x, multisite: yes, JP: yes, PHP: 8.1	1m 30s
WP 6.3.x, multisite: no, JP: yes, PHP: 8.1	1m 32s
WP 6.3.x, multisite: yes, JP: yes, PHP: 8.1	1m 29s
WP 6.4.x, multisite: no, JP: yes, PHP: 8.1	1m 30s
WP 6.4.x, multisite: yes, JP: yes, PHP: 8.1	1m 29s
WP 6.5.x, multisite: no, JP: yes, PHP: 8.1	1m 29s
WP 6.5.x, multisite: yes, JP: yes, PHP: 8.1	1m 30s
WP 6.6.x, multisite: no, JP: yes, PHP: 8.1	1m 30s
WP 6.6.x, multisite: yes, JP: yes, PHP: 8.1	1m 28s
WP latest, multisite: no, JP: yes, PHP: 8.1	1m 29s
WP latest, multisite: yes, JP: yes, PHP: 8.1	1m 28s
WP nightly, multisite: no, JP: yes, PHP: 8.1	1m 28s
WP nightly, multisite: yes, JP: yes, PHP: 8.1	1m 27s
WP latest, multisite: no, JP: no, PHP: 8.1	1m 17s
WP latest, multisite: yes, JP: no, PHP: 8.1	1m 17s
WP nightly, multisite: no, JP: yes, PHP: 8.2	1m 28s
WP nightly, multisite: yes, JP: yes, PHP: 8.2	1m 29s
WP nightly, multisite: no, JP: yes, PHP: 8.3	1m 15s
WP nightly, multisite: yes, JP: yes, PHP: 8.3	1m 28s
	32m 7s

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