adopt latest golang enhancements (#91)

pkg/es/parallel.go

@@ -19,7 +19,6 @@ package es
 import (
 	"context"
 	"fmt"
-	"sync"
 
 	"codeberg.org/scip/esctl/pkg/cfg"
 	"github.com/elastic/go-elasticsearch/v9"
@@ -61,14 +60,7 @@ type apiResponse struct {
 	which            int
 }
 
-func getApiData(
-	conf *cfg.Config,
-	es *elasticsearch.TypedClient,
-	wg *sync.WaitGroup,
-	reschan chan apiResponse,
-	which string) {
-	defer wg.Done()
-
+func getApiData(conf *cfg.Config, es *elasticsearch.TypedClient, reschan chan apiResponse, which string) {
 	apiRes := apiResponse{}
 
 	var arerr error