Update meta.yaml (#13674)

ℹ️
Bioconda has finished the [GCC7 migration](#13578). If you are dealing with C/C++ or Python package it can be that you need to rebuild other dependent packages. [Bioconda utils - update-pinning](https://bioconda.github.io/updating.html#updating-recipes-for-a-pinning-change) will assist you with that. If you have any questions please use [issue 13578](#13578).

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* [ ] I have read the [guidelines for bioconda recipes](https://bioconda.github.io/guidelines.html).
* [ ] This PR adds a new recipe.
* [ ] AFAIK, this recipe **is directly relevant to the biological sciences** (otherwise, please submit to the more general purpose [conda-forge channel](https://conda-forge.org/docs/)).
* [ ] This PR updates an existing recipe.
* [ ] This PR does something else (explain below).

recipes/anndata/meta.yaml

@@ -1,5 +1,5 @@
-{% set version = "0.6.17" %}
-{% set sha256 = "efa4b1d1ab66959581bc8e56e5df79c42cebcd5bcfc70cefe76a6a294cfbb094" %}
+{% set version = "0.6.18" %}
+{% set sha256 = "e3f001e4503f24235cfda111d37d2a51011a6fe5dc917ee4d77831a6a41fa80f" %}
 
 package:
   name: anndata