feat: repalce deprecated .permissionPolicy with .permissionsPolicyHeader

Author: jornfranke

backend/src/main/java/eu/zuinnote/example/springwebdemo/configuration/GeneralSecurityConfiguration.java

@@ -58,7 +58,7 @@ private void setHttpSecurityHeaders(HttpSecurity http) throws Exception {
         // permission policy
         http.headers(
                         headers ->
-                                headers.permissionsPolicy(
+                                headers.permissionsPolicyHeader(
                                         permissions ->
                                                 permissions.policy(
                                                         config.getHttps()