feat(vpn): rotate filtered servers on internal vpn restarts

- Fix #290

internal/provider/mullvad/connection_test.go

@@ -2,7 +2,6 @@ package mullvad
 
 import (
 	"errors"
-	"math/rand"
 	"net/http"
 	"net/netip"
 	"testing"
@@ -59,10 +58,9 @@ func Test_Provider_GetConnection(t *testing.T) {
 			storage := common.NewMockStorage(ctrl)
 			storage.EXPECT().FilterServers(provider, testCase.selection).
 				Return(testCase.filteredServers, testCase.storageErr)
-			randSource := rand.NewSource(0)
 
 			client := (*http.Client)(nil)
-			provider := New(storage, randSource, client)
+			provider := New(storage, client)
 
 			connection, err := provider.GetConnection(testCase.selection, testCase.ipv6Supported)