cache test: loosen conditions on cache usage

This fixes config_tests on aarch64 macOS.
The key difference is that they use 16k pages,
so LMDB space usage also behaves a bit different.

daemon/cache.test/clear.test.lua

@@ -197,15 +197,15 @@ end
 return {
 	test_cache_used(0, 1),
 	import_zone,
-	test_cache_used(9, 10),
+	test_cache_used(9, 11),
 	test_exact_match_qtype,
 	test_exact_match_qname,
 	test_callback,
 	import_zone,
 	test_subtree,
-	test_cache_used(9, 10),
+	test_cache_used(9, 11),
 	test_subtree_limit,
-	test_cache_used(5, 7),
+	test_cache_used(5, 8),
 	test_apex,
 	import_zone,
 	test_root,