Do not include STAR as a dependency for osx-arm64

* STAR is only needed by rmats when starting with fastq files
* WARNING: failed to get package records, retrying.  exception was: Unsatisfiable dependencies for platform osx-arm64: {MatchSpec("star[version='>=2.5']")}
  + STAR --version [...]run_test.sh: line 7: [...]/bin/STAR: Bad CPU type in executable

recipes/rmats/meta.yaml

@@ -39,7 +39,7 @@ requirements:
     - numpy
     - gsl
     - zlib
-    - star >=2.5
+    - star >=2.5 # [not osx-arm64]
 
 test:
   commands: