Fix test build failures on 32-bit arch again (prometheus-community#919)

Another case of untyped integer overflows on 32-bit arch.

Signed-off-by: Daniel Swarbrick <daniel.swarbrick@gmail.com>
Signed-off-by: Deryugin, Nikolay <nikolay.deryugin@itglobal.com>

Author: dswarbrick

Diff for: collector/pg_stat_walreceiver_test.go

@@ -64,13 +64,13 @@ func TestPGStatWalReceiverCollectorWithFlushedLSN(t *testing.T) {
 			"foo",
 			"bar",
 			"stopping",
-			1200668684563608,
+			int64(1200668684563608),
 			1687321285,
-			1200668684563609,
+			int64(1200668684563609),
 			1687321280,
 			1687321275,
 			1687321276,
-			1200668684563610,
+			int64(1200668684563610),
 			1687321277,
 			5,
 		)
@@ -143,12 +143,12 @@ func TestPGStatWalReceiverCollectorWithNoFlushedLSN(t *testing.T) {
 			"foo",
 			"bar",
 			"starting",
-			1200668684563608,
+			int64(1200668684563608),
 			1687321285,
 			1687321280,
 			1687321275,
 			1687321276,
-			1200668684563610,
+			int64(1200668684563610),
 			1687321277,
 			5,
 		)