ci: pin to py38 to avoid initial py39 astropy issues

Author: scivision

.github/workflows/ci.yml

@@ -4,8 +4,7 @@ on:
   push:
     paths:
     - "**.py"
-  pull_request:
-  release:
+
 
 jobs:
 
@@ -15,7 +14,7 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-python@v1
       with:
-        python-version: '3.x'
+        python-version: 3.8
     - run: pip install .[full,tests,lint]
 
     - run: flake8

.github/workflows/ci_stdlib_only.yml

@@ -4,8 +4,7 @@ on:
   push:
     paths:
     - "**.py"
-  pull_request:
-  release:
+
 
 jobs: