chore: Fixed test

[baseballyama]

I think the reason of this failure is typescript-eslint/typescript-eslint#10454

+ expected - actual

     "ruleId": "@typescript-eslint/no-unnecessary-condition",
     "code": "foo == null",
     "line": 4,
     "column": 15,
-    "message": "Unnecessary conditional, comparison is always true, since `null == null` is true."
+    "message": "Unnecessary conditional, comparison is always true. Both sides of the comparison always have a literal type."
   },
   {
     "ruleId": "@typescript-eslint/no-unnecessary-condition",
     "code": "bar == null",
     "line": 8,
     "column": 13,
-    "message": "Unnecessary conditional, comparison is always true, since `null == null` is true."
+    "message": "Unnecessary conditional, comparison is always true. Both sides of the comparison always have a literal type."
   }
 ]

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