[CHORE] Cleanup dependency

- Remove `gitea.com/lunny/dingtalk_webhook` as dependency, we only use
two structs which are small enough to be recreated in Forgejo and don't
need to rely on the dependency.
- Existing tests (thanks @oliverpool) prove that this has no effect.

go.mod

@@ -12,7 +12,6 @@ require (
 	gitea.com/go-chi/cache v0.2.0
 	gitea.com/go-chi/captcha v0.0.0-20240315150714-fb487f629098
 	gitea.com/go-chi/session v0.0.0-20240316035857-16768d98ec96
-	gitea.com/lunny/dingtalk_webhook v0.0.0-20171025031554-e3534c89ef96
 	gitea.com/lunny/levelqueue v0.4.2-0.20230414023320-3c0159fe0fe4
 	github.com/42wim/sshsig v0.0.0-20211121163825-841cf5bbc121
 	github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358

go.sum

@@ -62,8 +62,6 @@ gitea.com/go-chi/captcha v0.0.0-20240315150714-fb487f629098 h1:p2ki+WK0cIeNQuqjR
 gitea.com/go-chi/captcha v0.0.0-20240315150714-fb487f629098/go.mod h1:LjzIOHlRemuUyO7WR12fmm18VZIlCAaOt9L3yKw40pk=
 gitea.com/go-chi/session v0.0.0-20240316035857-16768d98ec96 h1:IFDiMBObsP6CZIRaDLd54SR6zPYAffPXiXck5Xslu0Q=
 gitea.com/go-chi/session v0.0.0-20240316035857-16768d98ec96/go.mod h1:0iEpFKnwO5dG0aF98O4eq6FMsAiXkNBaDIlUOlq4BtM=
-gitea.com/lunny/dingtalk_webhook v0.0.0-20171025031554-e3534c89ef96 h1:+wWBi6Qfruqu7xJgjOIrKVQGiLUZdpKYCZewJ4clqhw=
-gitea.com/lunny/dingtalk_webhook v0.0.0-20171025031554-e3534c89ef96/go.mod h1:VyMQP6ue6MKHM8UsOXfNfuMKD0oSAWZdXVcpHIN2yaY=
 gitea.com/lunny/levelqueue v0.4.2-0.20230414023320-3c0159fe0fe4 h1:IFT+hup2xejHqdhS7keYWioqfmxdnfblFDTGoOwcZ+o=
 gitea.com/lunny/levelqueue v0.4.2-0.20230414023320-3c0159fe0fe4/go.mod h1:HBqmLbz56JWpfEGG0prskAV97ATNRoj5LDmPicD22hU=
 gitea.com/xorm/sqlfiddle v0.0.0-20180821085327-62ce714f951a h1:lSA0F4e9A2NcQSqGqTOXqu2aRi/XEQxDCBwM8yJtE6s=

services/webhook/dingtalk.go

@@ -16,8 +16,6 @@ import (
 	"code.gitea.io/gitea/modules/util"
 	webhook_module "code.gitea.io/gitea/modules/webhook"
 	"code.gitea.io/gitea/services/forms"
-
-	dingtalk "gitea.com/lunny/dingtalk_webhook"
 )
 
 type dingtalkHandler struct{}
@@ -42,8 +40,22 @@ func (dingtalkHandler) FormFields(bind func(any)) FormFields {
 }
 
 type (
-	// DingtalkPayload represents
+	// DingtalkPayload represents an dingtalk payload.
-	DingtalkPayload dingtalk.Payload
+	DingtalkPayload struct {
+		MsgType string `json:"msgtype"`
+		Text    struct {
+			Content string `json:"content"`
+		} `json:"text"`
+		ActionCard DingtalkActionCard `json:"actionCard"`
+	}
+
+	DingtalkActionCard struct {
+		Text        string `json:"text"`
+		Title       string `json:"title"`
+		HideAvatar  string `json:"hideAvatar"`
+		SingleTitle string `json:"singleTitle"`
+		SingleURL   string `json:"singleURL"`
+	}
 )
 
 // Create implements PayloadConvertor Create method
@@ -195,7 +207,7 @@ func (dc dingtalkConvertor) Package(p *api.PackagePayload) (DingtalkPayload, err
 func createDingtalkPayload(title, text, singleTitle, singleURL string) DingtalkPayload {
 	return DingtalkPayload{
 		MsgType: "actionCard",
-		ActionCard: dingtalk.ActionCard{
+		ActionCard: DingtalkActionCard{
 			Text:        strings.TrimSpace(text),
 			Title:       strings.TrimSpace(title),
 			HideAvatar:  "0",