chore: make use of go1.26 features (#12369)

Allows us to make use of Go features introduced in v1.26.

I require a feature from v1.26 for a PR I want to make later.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12369
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>

routers/api/actions/artifactsv4.go

@@ -562,7 +562,7 @@ func (r *artifactV4Routes) downloadArtifact(ctx *ArtifactContext) {
 		return
 	}
 
-	common.ServeContentByReadSeeker(ctx.Base, artifactName, util.ToPointer(artifact.UpdatedUnix.AsTime()), file)
+	common.ServeContentByReadSeeker(ctx.Base, artifactName, new(artifact.UpdatedUnix.AsTime()), file)
 }
 
 func (r *artifactV4Routes) deleteArtifact(ctx *ArtifactContext) {

routers/api/actions/oidc.go

@@ -103,8 +103,7 @@ func OIDCRoutes(prefix string) *web.Route {
 	// and inspecting the names of the json struct tags
 	rt := reflect.TypeFor[actions_service.IDTokenCustomClaims]()
 
-	for i := 0; i < rt.NumField(); i++ {
-		f := rt.Field(i)
+	for f := range rt.Fields() {
 		v := strings.Split(f.Tag.Get("json"), ",")[0]
 		if v == "" || v == "-" {
 			continue

routers/web/repo/attachment.go

@@ -13,7 +13,6 @@ import (
 	"forgejo.org/modules/log"
 	"forgejo.org/modules/setting"
 	"forgejo.org/modules/storage"
-	"forgejo.org/modules/util"
 	"forgejo.org/routers/common"
 	"forgejo.org/services/attachment"
 	"forgejo.org/services/context"
@@ -154,7 +153,7 @@ func ServeAttachment(ctx *context.Context, uuid string) {
 	}
 	defer fr.Close()
 
-	common.ServeContentByReadSeeker(ctx.Base, attach.Name, util.ToPointer(attach.CreatedUnix.AsTime()), fr)
+	common.ServeContentByReadSeeker(ctx.Base, attach.Name, new(attach.CreatedUnix.AsTime()), fr)
 }
 
 // GetAttachment serve attachments