Switch to the new Teams API

https://developer.github.com/changes/2020-01-21-moving-the-team-api-endpoints/
https://github.blog/changelog/2022-02-22-sunset-notice-deprecated-teams-api-endpoints/

Fixes #1386

src/main/java/org/kohsuke/github/GHTeam.java

@@ -1,6 +1,7 @@
 package org.kohsuke.github;
 
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
+import org.apache.commons.lang3.StringUtils;
 
 import java.io.IOException;
 import java.net.URL;
@@ -211,7 +212,7 @@ public Set<GHUser> getMembers() throws IOException {
      */
     public boolean hasMember(GHUser user) {
         try {
-            root().createRequest().withUrlPath("/teams/" + getId() + "/members/" + user.getLogin()).send();
+            root().createRequest().withUrlPath(api("/memberships/" + user.getLogin())).send();
             return true;
         } catch (IOException ignore) {
             return false;
@@ -345,7 +346,13 @@ public void delete() throws IOException {
     }
 
     private String api(String tail) {
-        return "/teams/" + getId() + tail;
+        if (organization == null) {
+            // Teams returned from pull requests to do not have an organization. Attempt to use url.
+            final URL url = Objects.requireNonNull(getUrl(), "Missing instance URL!");
+            return StringUtils.prependIfMissing(url.toString().replace(root().getApiUrl(), ""), "/") + tail;
+        }
+
+        return "/organizations/" + organization.getId() + "/team/" + getId() + tail;
     }
 
     /**

src/test/java/org/kohsuke/github/GHTeamTest.java

@@ -91,7 +91,9 @@ public void listMembersNoMatch() throws IOException {
 
     @Test
     public void testSetPrivacy() throws IOException {
-        String teamSlug = "dummy-team";
+        // we need to use a team that doesn't have child teams
+        // as secret privacy is not supported for parent teams
+        String teamSlug = "simple-team";
         Privacy privacy = Privacy.CLOSED;
 
         // Set the privacy.