NOTICKET: Fix API Spec

src/test/java/de/towerdefence/server/server/GetAllPlayersTest.java

@@ -13,7 +13,7 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
 class GetAllPlayersTest extends IntegrationTest {
 
     private MockHttpServletRequestBuilder createGetAllPlayersRequest(String requestBody) {
-        return MockMvcRequestBuilders.post(baseUri + "/admin/players")
+        return MockMvcRequestBuilders.get(baseUri + "/admin/players")
                 .contentType(MediaType.APPLICATION_JSON)
                 .content(requestBody);
     }