Pin GitHub API version in requests (#4647)

Signed-off-by: utafrali <tafraliugur@gmail.com>

connector/github/github.go

@@ -28,6 +28,8 @@ const (
 	// GitHub requires this scope to access '/user/teams' and '/orgs' API endpoints
 	// which are used when a client includes the 'groups' scope.
 	scopeOrgs = "read:org"
+	// githubAPIVersion pins the GitHub REST API version used in requests.
+	githubAPIVersion = "2022-11-28"
 )
 
 // Pagination URL patterns
@@ -462,6 +464,7 @@ func get(ctx context.Context, client *http.Client, apiURL string, v interface{})
 		return "", fmt.Errorf("github: new req: %v", err)
 	}
 	req = req.WithContext(ctx)
+	req.Header.Set("X-GitHub-Api-Version", githubAPIVersion)
 	resp, err := client.Do(req)
 	if err != nil {
 		return "", fmt.Errorf("github: get URL %v", err)
@@ -659,6 +662,7 @@ func (c *githubConnector) userInOrg(ctx context.Context, client *http.Client, us
 		return false, fmt.Errorf("github: new req: %v", err)
 	}
 	req = req.WithContext(ctx)
+	req.Header.Set("X-GitHub-Api-Version", githubAPIVersion)
 	resp, err := client.Do(req)
 	if err != nil {
 		return false, fmt.Errorf("github: get teams: %v", err)

connector/github/github_test.go

@@ -485,6 +485,21 @@ func Test_Open_PreferredDomainConfig(t *testing.T) {
 	}
 }
 
+func TestGetSendsAPIVersionHeader(t *testing.T) {
+	var gotHeader string
+	s := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gotHeader = r.Header.Get("X-GitHub-Api-Version")
+		w.Header().Add("Content-Type", "application/json")
+		json.NewEncoder(w).Encode([]org{})
+	}))
+	defer s.Close()
+
+	var result []org
+	_, err := get(context.Background(), newClient(), s.URL+"/user/orgs", &result)
+	expectNil(t, err)
+	expectEquals(t, gotHeader, githubAPIVersion)
+}
+
 func newTestServer(responses map[string]testResponse) *httptest.Server {
 	var s *httptest.Server
 	s = httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {