Alerting: Update imported prometheus alertmanager version. Backport (#56228) (#56430)

Version 0.24.0 has a few bugs that cause panics. We update here to the
latest commit on github.com/prometheus/alertmanager's main branch.

Panic Bugs:
https://github.com/prometheus/alertmanager/issues/2936
https://github.com/prometheus/alertmanager/issues/3064

(cherry picked from commit ce89624ca2)

pkg/services/ngalert/notifier/alertmanager.go

@@ -206,7 +206,7 @@ func newAlertmanager(ctx context.Context, orgID int64, cfg *setting.Cfg, store A
 	}()
 
 	// Initialize in-memory alerts
-	am.alerts, err = mem.NewAlerts(context.Background(), am.marker, memoryAlertsGCInterval, nil, am.logger)
+	am.alerts, err = mem.NewAlerts(context.Background(), am.marker, memoryAlertsGCInterval, nil, am.logger, m.Registerer)
 	if err != nil {
 		return nil, fmt.Errorf("unable to initialize the alert provider component of alerting: %w", err)
 	}

pkg/services/ngalert/notifier/alertmanager_test.go

@@ -314,7 +314,7 @@ func TestPutAlert(t *testing.T) {
 		t.Run(c.title, func(t *testing.T) {
 			r := prometheus.NewRegistry()
 			am.marker = types.NewMarker(r)
-			am.alerts, err = mem.NewAlerts(context.Background(), am.marker, 15*time.Minute, nil, am.logger)
+			am.alerts, err = mem.NewAlerts(context.Background(), am.marker, 15*time.Minute, nil, am.logger, r)
 			require.NoError(t, err)
 
 			alerts := []*types.Alert{}

pkg/services/ngalert/notifier/channels/telegram_test.go

@@ -93,7 +93,7 @@ func TestTelegramNotifier(t *testing.T) {
 			},
 			expMsg: map[string]string{
 				"parse_mode": "html",
-				"text":       strings.Repeat("1", 4096-3) + "...",
+				"text":       strings.Repeat("1", 4096-1) + "…",
 			},
 			expMsgError: nil,
 		}, {

pkg/services/ngalert/notifier/multiorg_alertmanager.go

@@ -85,7 +85,7 @@ func NewMultiOrgAlertmanager(cfg *setting.Cfg, configStore AlertingStore, orgSto
 			true,
 			cfg.UnifiedAlerting.HAPushPullInterval,
 			cfg.UnifiedAlerting.HAGossipInterval,
-			cluster.DefaultTcpTimeout,
+			cluster.DefaultTCPTimeout,
 			cluster.DefaultProbeTimeout,
 			cluster.DefaultProbeInterval,
 			nil,