Fix PTtools version on GitHub Actions

Author: AgenttiX

.github/workflows/main.yml

@@ -31,7 +31,10 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: CFT-HY/pttools
-          ref: v0.9.0
+          # A specific commit is used instead of the 0.9.0 release,
+          # as the release is missing some __init__.py files in the example folders,
+          # which prevents the example scripts from being imported.
+          ref: da50329beba788803ba6bee2b497a89a98bea53d
           path: pttools
       - name: Setup Python
         uses: actions/setup-python@v5

msc2-python/requirements.txt

@@ -1,4 +1,4 @@
 numpy >= 2.1.3
 # This is how one could install PTtools without the example scripts
-# pttools-gw[numbalsoda,performance] == 0.9.0
+# pttools-gw[numbalsoda,performance]
 scipy >= 1.15.1