update env file

Author: KedoKudo

environment.yml

@@ -2,13 +2,15 @@ name: addie
 channels:
     - conda-forge
     - neutrons
-    - mantid/label/nightly
+    - mantid
     - oncat
 dependencies:
+    # base
+    - python=3.8
     # packaging
     - anaconda-client
     - boa
-    - build
+    - python-build
     - conda-build
     - conda-verify
     - setuptools
@@ -30,4 +32,3 @@ dependencies:
     - pytest
     - pytest-mpl
     - pytest-qt
-