Update framework.yml to environment.yml

environment.yml

+name: tutorial-env
+channels:
+    - conda-forge
+dependencies:
+    - python>=3.8
+    - numpy
+    - matplotlib
+    - scipy
+    - astroquery
+    - astropy
+    - tensorflow-gpu 2.4.1

framework.yml

----
- Conda 4.10.1
- Python 3.8.5
- tensorflow-gpu 2.4.1
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