sqldb: bump modernc.org/sqlite to 1.29.10 which fixes init data race

Tracking issue: https://gitlab.com/cznic/sqlite/-/issues/180

invoices/invoices_test.go

@@ -234,9 +234,7 @@ func TestInvoices(t *testing.T) {
 	makeSQLDB := func(t *testing.T, sqlite bool) invpkg.InvoiceDB {
 		var db *sqldb.BaseDB
 		if sqlite {
-			sqliteConstructorMu.Lock()
 			db = sqldb.NewTestSqliteDB(t).BaseDB
-			sqliteConstructorMu.Unlock()
 		} else {
 			db = sqldb.NewTestPostgresDB(t, pgFixture).BaseDB
 		}