Replace post-deploy script with pip statement within environment definition

Author: ahmig

workflow/envs/biopython.post-deploy.sh

@@ -6,4 +6,5 @@ dependencies:
   - biopython==1.81
   - pandas==2.0.3
   - pip==23.2.1
-  - mafft==7.525
+  - pip:
+    - gb2seq==0.2.20