Nicheformer: ENSEMBL and attn maps (#354)

[bputzeys]

We are adding:

1. Conversion of gene IDs to ENSEMBL - Automatic conversion to ENSEMBL gene identifiers for Nicheformer #352
2. Facilities for attention map extraction - Add attention map inspection facilities to the Nicheformer's wrapper #353

We are bumping a dependency version:
black 26.1.0 -> 26.3.1

Bump version