Update dependencies and go1.18 (#1873)

* Update dependencies and go1.18

* Exclude unnecessary linters and update build to go1.18

vendor/github.com/slack-go/slack/chat.go

@@ -64,6 +64,9 @@ type PostMessageParameters struct {
 	// chat.postEphemeral support
 	Channel string `json:"channel"`
 	User    string `json:"user"`
+
+	// chat metadata support
+	MetaData SlackMetadata `json:"metadata"`
 }
 
 // NewPostMessageParameters provides an instance of PostMessageParameters with all the sane default values set
@@ -285,6 +288,7 @@ type sendConfig struct {
 	endpoint        string
 	values          url.Values
 	attachments     []Attachment
+	metadata        SlackMetadata
 	blocks          Blocks
 	responseType    string
 	replaceOriginal bool
@@ -306,6 +310,7 @@ func (t sendConfig) BuildRequestContext(ctx context.Context, token, channelID st
 			endpoint:        t.endpoint,
 			values:          t.values,
 			attachments:     t.attachments,
+			metadata:        t.metadata,
 			blocks:          t.blocks,
 			responseType:    t.responseType,
 			replaceOriginal: t.replaceOriginal,
@@ -336,6 +341,7 @@ type responseURLSender struct {
 	endpoint        string
 	values          url.Values
 	attachments     []Attachment
+	metadata        SlackMetadata
 	blocks          Blocks
 	responseType    string
 	replaceOriginal bool
@@ -352,6 +358,7 @@ func (t responseURLSender) BuildRequestContext(ctx context.Context) (*http.Reque
 		Timestamp:       t.values.Get("ts"),
 		Attachments:     t.attachments,
 		Blocks:          t.blocks,
+		Metadata:        t.metadata,
 		ResponseType:    t.responseType,
 		ReplaceOriginal: t.replaceOriginal,
 		DeleteOriginal:  t.deleteOriginal,
@@ -662,6 +669,18 @@ func MsgOptionIconEmoji(iconEmoji string) MsgOption {
 	}
 }
 
+// MsgOptionMetadata sets message metadata
+func MsgOptionMetadata(metadata SlackMetadata) MsgOption {
+	return func(config *sendConfig) error {
+		config.metadata = metadata
+		meta, err := json.Marshal(metadata)
+		if err == nil {
+			config.values.Set("metadata", string(meta))
+		}
+		return err
+	}
+}
+
 // UnsafeMsgOptionEndpoint deliver the message to the specified endpoint.
 // NOTE: USE AT YOUR OWN RISK: No issues relating to the use of this Option
 // will be supported by the library, it is subject to change without notice that