Drastically increase allowed test times for potato CI

The context timeouts for tests are designed to give a better error
message when something hangs rather than the test just timing out.
Unfortunately, the potato CI frequently has some test or another
randomly take a long time. While the increased times are somewhat less
than optimal on a real computer, hopefully this will solve the
flickering CI.

pgtype/example_child_records_test.go

@@ -21,7 +21,7 @@ type Team struct {
 
 // This example uses a single query to return parent and child records.
 func Example_childRecords() {
-	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
 	defer cancel()
 
 	conn, err := pgx.Connect(ctx, os.Getenv("PGX_TEST_DATABASE"))

pgtype/hstore_test.go

@@ -221,7 +221,7 @@ func TestHstoreCodec(t *testing.T) {
 	pgxtest.RunValueRoundTripTests(context.Background(), t, ctrWithoutCodec, pgxtest.AllQueryExecModes, "hstore", tests)
 
 	// scan empty and NULL: should be different in all query modes
-	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
 	defer cancel()
 
 	pgxtest.RunWithQueryExecModes(ctx, t, ctr, pgxtest.AllQueryExecModes, func(ctx context.Context, t testing.TB, conn *pgx.Conn) {