Fix remaining strict types errors

[millnut]

With Drupal core moving towards strict types, more info we should fix the remaining errors suppressed in the phpstan baseline.

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  Line   modules/contrib/localgov_search/modules/localgov_search_db/tests/Kernel/InstallTest.php
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  34     Call to method Drupal\KernelTests\KernelTestBase::setUp() with incorrect case: setup
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  Line   modules/contrib/localgov_search/tests/src/Kernel/ContentTypesAddedToSearchTest.php
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  39     Call to method Drupal\KernelTests\KernelTestBase::setUp() with incorrect case: setup
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[millnut]

Closing this issue as this has been fixed