chore(lint): upgrade golangci-lint to v1.47.2

- Fix Slowloris attacks on HTTP servers
- Force set default of 5 minutes for pprof read timeout
- Change `ShutdownTimeout` to time.Duration since it cannot be set to 0

internal/pprof/settings.go

@@ -2,6 +2,7 @@ package pprof
 
 import (
 	"errors"
+	"time"
 
 	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
 	"github.com/qdm12/gluetun/internal/httpserver"
@@ -27,6 +28,8 @@ type Settings struct {
 func (s *Settings) SetDefaults() {
 	s.Enabled = helpers.DefaultBool(s.Enabled, false)
 	s.HTTPServer.Address = helpers.DefaultString(s.HTTPServer.Address, "localhost:6060")
+	const defaultReadTimeout = 5 * time.Minute // for CPU profiling
+	s.HTTPServer.ReadTimeout = helpers.DefaultDuration(s.HTTPServer.ReadTimeout, defaultReadTimeout)
 	s.HTTPServer.SetDefaults()
 }