[CI] Upgrade `resource_class` for `test_preview_mt` #10651

Job	Run time
check_format	1m 46s
x86_64-gnu-test-preview_mt	5m 51s
x86_64-gnu-test (1.7.3)	33m 22s
x86_64-gnu-test (1.8.2)	32m 45s
x86_64-musl-test	36m 16s
x86_64-gnu-test (1.9.2)	33m 28s
x86_64-gnu-test (1.10.1)	32m 9s
x86_64-gnu-test (1.11.2)	32m 23s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 31s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 29s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	33m 8s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	33m 44s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	34m 44s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	34m 17s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	32m 34s
deploy_api_docs	0s
	7h 24m 27s

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