Replace prec_pari_to_bits usage

Co-authored-by: Gonzalo Tornaría <tornaria@cmat.edu.uy>

src/sage/schemes/elliptic_curves/ell_point.py

@@ -3712,7 +3712,7 @@ def elliptic_logarithm(self, embedding=None, precision=100,
         E_pari = E_work.pari_curve()
         log_pari = E_pari.ellpointtoz(pt_pari, precision=working_prec)
 
-        while prec_pari_to_bits(log_pari.precision()) < precision:
+        while log_pari.bitprecision() < precision:
             # result is not precise enough, re-compute with double
             # precision. if the base field is not QQ, this
             # requires modifying the precision of the embedding,