Old benchmarks staying around

[ilan-gold]

https://github.com/scverse/anndata/pull/1119/checks

So I have a benchmark run here (hopefully the same, screenshot attached) where anndata.GarbargeCollectionSuite.peakmem_garbage_collection and anndata.peakmem_garbage_collection have both been removed but still appear and seem to be run against main. I'm not sure why.