Revert "Upgrade to go 1.19 and update dependencies (#3069)" (#3085)

This reverts commit bba7c23957.

vendor/github.com/99designs/gqlgen/codegen/generate.go

@@ -1,10 +1,9 @@
 package codegen
 
 import (
-	"embed"
 	"errors"
 	"fmt"
-	"os"
+	"io/ioutil"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -14,9 +13,6 @@ import (
 	"github.com/vektah/gqlparser/v2/ast"
 )
 
-//go:embed *.gotpl
-var codegenTemplates embed.FS
-
 func GenerateCode(data *Data) error {
 	if !data.Config.Exec.IsDefined() {
 		return fmt.Errorf("missing exec config")
@@ -40,7 +36,6 @@ func generateSingleFile(data *Data) error {
 		RegionTags:      true,
 		GeneratedHeader: true,
 		Packages:        data.Config.Packages,
-		TemplateFS:      codegenTemplates,
 	})
 }
 
@@ -87,7 +82,6 @@ func generatePerSchema(data *Data) error {
 			RegionTags:      true,
 			GeneratedHeader: true,
 			Packages:        data.Config.Packages,
-			TemplateFS:      codegenTemplates,
 		})
 		if err != nil {
 			return err
@@ -137,7 +131,7 @@ func generateRootFile(data *Data) error {
 	_, thisFile, _, _ := runtime.Caller(0)
 	rootDir := filepath.Dir(thisFile)
 	templatePath := filepath.Join(rootDir, "root_.gotpl")
-	templateBytes, err := os.ReadFile(templatePath)
+	templateBytes, err := ioutil.ReadFile(templatePath)
 	if err != nil {
 		return err
 	}
@@ -151,7 +145,6 @@ func generateRootFile(data *Data) error {
 		RegionTags:      false,
 		GeneratedHeader: true,
 		Packages:        data.Config.Packages,
-		TemplateFS:      codegenTemplates,
 	})
 }