[ci skip] update version number

Sadly, 0.4.0 did not finally fix the reading of dtype=object arrays.

update_scripts/pyiron_base_0.3_to_0.4.py

@@ -1,6 +1,6 @@
 """
 pyiron_base<=0.3.10 has a bug that writes all arrays with dtype=object even
-numeric ones.  As a fix pyiron_base=0.4.0 introduces a conversion when reading
+numeric ones.  As a fix pyiron_base=0.4.1 introduces a conversion when reading
 such arrays, but does not automatically save them.  This conversion script
 simply goes over all jobs and rewrites their HDF5 files, since it's read with
 the correct dtype, this then writes this correct dtype.