Use more specific versions.

hpcpy24.yaml

@@ -2,9 +2,9 @@ name: hpcpy_jsc_2024
 channels:
     - conda-forge
 dependencies:
-    - python = 3.11
+    - python = 3.11.3
     - numpy = 1.25.1
-    - scipy
+    - scipy = 1.11.1
     - matplotlib = 3.7.2
     - numba = 0.58.1
     - dask = 2023.9.2
@@ -20,4 +20,4 @@ dependencies:
     - gfortran = 12.3.0
     - gxx = 12.3.0
     - cmake = 3.26.3
-    - threadpoolctl
\ No newline at end of file
+    - threadpoolctl = 3.1.0
\ No newline at end of file