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test: fix flaky #10148 test

The test may exceed the default fiber slice (1 second):

```
[060] server | 2024-09-09 09:16:16.329 [33093] main/111/main fiber.h:1132 W> fiber has not yielded for more than 0.500 seconds
[060] server | 2024-09-09 09:16:16.825 [33093] main/111/main/test-run.lib.luatest.luatest.log I> Assert "FiberSliceIsExceeded" equals to "OutOfMemory"
[060] not ok 1	box-luatest.gh_10148_fix_crash_low_slab_alloc_factor.test_low_slab_alloc_factor
[060] #   ...uatest/gh_10148_fix_crash_low_slab_alloc_factor_test.lua:36: expected: "OutOfMemory"
[060] #   actual: "FiberSliceIsExceeded"
[060] #   stack traceback:
[060] #   	...uatest/gh_10148_fix_crash_low_slab_alloc_factor_test.lua:30: in function 'box-luatest.gh_10148_fix_crash_low_slab_alloc_factor.test_low_slab_alloc_factor'
[060] #   	...
[060] #   	[C]: in function 'xpcall'
[060] #   artifacts:
[060] #   	server -> /tmp/t/060_box-luatest/artifacts/server-RulP4Fj6qEoI
[060] luatest | 2024-09-09 09:16:16.839 [32904] main/104/luatest/test-run.lib.luatest.luatest.log I> End test "box-luatest.gh_10148_fix_crash_low_slab_alloc_factor.test_low_slab_alloc_factor"
[060] server | 2024-09-09 09:16:16.849 [33093] main/116/iproto.shutdown I> tx_binary: stopped
[060] # Ran 1 tests in 2.388 seconds, 0 succeeded, 1 failed
```

Let's set the fiber slice to a sufficiently big value.

Fixes commit e4ce9e111483 ("test: add test for #10148").

NO_DOC=test fix
NO_CHANGELOG=test fix

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