Update module github.com/bwmarrin/discordgo to v0.28.1

Author: renovate[bot]

go.mod

@@ -4,7 +4,7 @@ go 1.19
 
 require (
 	github.com/ajvpot/blocksaas v0.0.0-20211225041512-7603a7930e46
-	github.com/bwmarrin/discordgo v0.27.1
+	github.com/bwmarrin/discordgo v0.28.1
 	github.com/go-jet/jet/v2 v2.10.1
 	github.com/go-masonry/mortar v1.0.32
 	github.com/lib/pq v1.10.9