Aston Martin’s regular podium-challenging form from the first third of the Formula 1 season feels like a distant memory despite Fernando Alonso finishing second just a couple of grands prix ago. It’s looking more and more like that Alonso podium at Zandvoort was down to some of the two-time world champion’s magic and others underachieving than it was to Aston Martin getting back to where it was in the pecking order earlier this year. But Aston Martin has not given up. It plans to keep developing its AMR23 “deep” into this final stage of season, and is talking a good…