Fix version of Python reproject when running tests

Author: giordano

.github/workflows/ci.yml

@@ -8,7 +8,8 @@ on:
   release:
 
 env:
-  PYTHON: ""
+  # `reproject=0.5` is not compatible with Python >= 3.8
+  PYTHON: "python3.7"
 
 jobs:
   test:

test/runtests.jl

@@ -4,9 +4,8 @@ using Conda, PyCall
 using FITSIO, WCS
 using SHA: sha256
 
-ENV["PYTHON"]=""
 Conda.add_channel("astropy")
-Conda.add("reproject")
+Conda.add("reproject=0.5")
 rp = pyimport("reproject")
 astropy = pyimport("astropy")