Fix CreateOrUpdateOrgSecret regression introduced in v53

`CreateOrUpdateOrgSecret`'s API uses `string` for selected repository
IDS while other APIs use `int`. This fixes the issue locally by
implementing its own type

github/dependabot_secrets.go

@@ -8,6 +8,7 @@ package github
 import (
 	"context"
 	"fmt"
+	"strconv"
 )
 
 func (s *DependabotService) getPublicKey(ctx context.Context, url string) (*PublicKey, *Response, error) {
@@ -144,8 +145,29 @@ func (s *DependabotService) CreateOrUpdateRepoSecret(ctx context.Context, owner,
 //
 // GitHub API docs: https://docs.github.com/en/rest/dependabot/secrets#create-or-update-an-organization-secret
 func (s *DependabotService) CreateOrUpdateOrgSecret(ctx context.Context, org string, eSecret *DependabotEncryptedSecret) (*Response, error) {
+	repoIDs := make([]string, len(eSecret.SelectedRepositoryIDs))
+	for i, secret := range eSecret.SelectedRepositoryIDs {
+		repoIDs[i] = strconv.Itoa(int(secret))
+	}
+	params := struct {
+		*DependabotEncryptedSecret
+		SelectedRepositoryIDs []string `json:"selected_repository_ids,omitempty"`
+	}{
+		DependabotEncryptedSecret: eSecret,
+		SelectedRepositoryIDs:     repoIDs,
+	}
+
+	putSecret := func(ctx context.Context, url string, eSecret interface{}) (*Response, error) {
+		req, err := s.client.NewRequest("PUT", url, eSecret)
+		if err != nil {
+			return nil, err
+		}
+
+		return s.client.Do(ctx, req, nil)
+	}
+
 	url := fmt.Sprintf("orgs/%v/dependabot/secrets/%v", org, eSecret.Name)
-	return s.putSecret(ctx, url, eSecret)
+	return putSecret(ctx, url, params)
 }
 
 func (s *DependabotService) deleteSecret(ctx context.Context, url string) (*Response, error) {

github/dependabot_secrets_test.go

@@ -352,7 +352,7 @@ func TestDependabotService_CreateOrUpdateOrgSecret(t *testing.T) {
 	mux.HandleFunc("/orgs/o/dependabot/secrets/NAME", func(w http.ResponseWriter, r *http.Request) {
 		testMethod(t, r, "PUT")
 		testHeader(t, r, "Content-Type", "application/json")
-		testBody(t, r, `{"key_id":"1234","encrypted_value":"QIv=","visibility":"selected","selected_repository_ids":[1296269,1269280]}`+"\n")
+		testBody(t, r, `{"key_id":"1234","encrypted_value":"QIv=","visibility":"selected","selected_repository_ids":["1296269","1269280"]}`+"\n")
 		w.WriteHeader(http.StatusCreated)
 	})