Use `somacore == 1.0.7` for `tiledbsoma` 1.7.2

[johnkerl]

We have some cloud CI failing because:

• tiledbsoma-feedstock has somacore >= 1.0.7 https://github.com/TileDB-Inc/tiledbsoma-feedstock/blob/6663e5111ccd0a74dd5e4f01781918f4bf52879d/recipe/meta.yaml#L112
• https://github.com/single-cell-data/TileDB-SOMA/pull/2001 is a PR that needs somacore 1.0.8` -- there are fails without that PR and with 1.0.8, and fails with that PR and without 1.0.8
• The aforementioned cloud PR is just a patch on top of existing tiledbsoma 1.7
• So I need to update tiledbsoma-feedstock to pin to somacore == 1.0.7 -- this PR

[johnkerl]

Thanks @jdblischak !