[TNT-83] refactor: OAuthService 필드 @Autowired 추가

Author: fakerdeft

src/test/java/com/tnt/application/member/OAuthServiceTest.java

@@ -24,6 +24,7 @@
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
@@ -48,6 +49,8 @@
 class OAuthServiceTest {
 
 	private MockWebServer mockWebServer;
+
+	@Autowired
 	private OAuthService oAuthService;
 
 	@Mock