fix security config for dataset request access endpoint

Author: jb-adams

src/main/java/org/ga4gh/refcloud/api/security/SecurityConfig.java

@@ -26,7 +26,7 @@ public class SecurityConfig {
     private static final List<RequestMatcher> ORY_KRATOS_SESSION_ENDPOINTS = List.of(
         PathPatternRequestMatcher.withDefaults().matcher(HttpMethod.GET, "/datasets"),
         PathPatternRequestMatcher.withDefaults().matcher(HttpMethod.GET, "/datasets/{datasetId}"),
-        PathPatternRequestMatcher.withDefaults().matcher(HttpMethod.GET, "/datasets/{datasetId}/request-access")
+        PathPatternRequestMatcher.withDefaults().matcher(HttpMethod.POST, "/datasets/{datasetId}/request-access")
     );
 
     private static final List<RequestMatcher> PUBLIC_ENDPOINTS = List.of(