include sourmash among dependencies

requirements-conda.txt

@@ -5,7 +5,7 @@ muscle=3.8.1551
 spades>=3.15.5
 fastani>=1.34
 mashtree>=1.4.6
-#sourmash-minimal>=4.8.6 ## see below
+sourmash-minimal>=4.8.6 ## see below
 #sourmash_plugin_branchwater>=0.9.1  ## running into resolver problems at least with our current version of python
 skani>=0.2.1
 #kwip>=0.2.0 ## relies on khmer, which as of 2024-03-12 does not support python 3.10