update: Lax Enum 값을 올바르게 사용하도록 수정

Author: snowykte0426

src/main/kotlin/com/team/incube/gsmc/v3/global/common/cookie/CookieUtil.kt

@@ -32,7 +32,7 @@ class CookieUtil(
             .from(name, value)
             .httpOnly(true)
             .secure(isProduction)
-            .sameSite(Cookie.SameSite.LAX.name)
+            .sameSite(Cookie.SameSite.LAX.attributeValue())
             .path("/")
             .maxAge(maxAge)
             .apply {