Revert "Bump Go version to 1.23.6 (#30242)" (#30359)

This reverts commit acbbd4c58d.

server/cmd/mmctl/commands/docs.go

@@ -36,7 +36,7 @@ func docsCmdF(cmd *cobra.Command, args []string) error {
 			return createErr
 		}
 	} else if !fileInfo.IsDir() {
-		return fmt.Errorf("File %q is not a directory", outDir)
+		return fmt.Errorf(fmt.Sprintf("File \"%s\" is not a directory", outDir))
 	}
 
 	err = doc.GenReSTTree(RootCmd, outDir)