chore(sources/env): bump gosettings to v0.3.0-rc9

internal/configuration/sources/env/vpn.go

@@ -2,14 +2,13 @@ package env
 
 import (
 	"fmt"
-	"strings"
 
 	"github.com/qdm12/gluetun/internal/configuration/settings"
 	"github.com/qdm12/gosettings/sources/env"
 )
 
 func (s *Source) readVPN() (vpn settings.VPN, err error) {
-	vpn.Type = strings.ToLower(env.Get("VPN_TYPE"))
+	vpn.Type = env.String("VPN_TYPE")
 
 	vpn.Provider, err = s.readProvider(vpn.Type)
 	if err != nil {