Pull request 1933: upd-golibs

Squashed commit of the following:

commit 081d10e6909def3a075707e75dbd0c5f63f91903
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Jul 20 14:17:01 2023 +0300

    aghnet: fix docs

commit 7433b72c0653cb33fe5ff810ae8a1346a6994f95
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Jul 20 14:03:16 2023 +0300

    all: imp tests; upd golibs

internal/next/websvc/websvc_test.go

@@ -12,11 +12,11 @@ import (
 	"testing"
 	"time"
 
-	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
 	"github.com/AdguardTeam/AdGuardHome/internal/next/agh"
 	"github.com/AdguardTeam/AdGuardHome/internal/next/dnssvc"
 	"github.com/AdguardTeam/AdGuardHome/internal/next/websvc"
 	"github.com/AdguardTeam/golibs/testutil"
+	"github.com/AdguardTeam/golibs/testutil/fakefs"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -90,7 +90,7 @@ func newTestServer(
 
 	c := &websvc.Config{
 		ConfigManager: confMgr,
-		Frontend: &aghtest.FS{
+		Frontend: &fakefs.FS{
 			OnOpen: func(_ string) (_ fs.File, _ error) { return nil, fs.ErrNotExist },
 		},
 		TLS:             nil,