PseudoPotentialData: Adapt to caching changes in aiida-core==2.6

In `aiida-core` v2.6.0, the caching API was changed. See this commit
e330004024ad5121f9bc82cbe972cd283f25fec8 . The method
`NodeCaching._get_objects_to_hash` was renamed to `get_objects_to_hash`.
To compute the hash, `compute_hash` should now be called instead of the
`get_hash`, which simply fetches the value stored in the extras.

src/aiida_pseudo/data/pseudo/pseudo.py

@@ -17,7 +17,7 @@
 class PseudoPotentialDataCaching(NodeCaching):
     """Class to define caching behavior of ``PseudoPotentialData`` nodes."""
 
-    def _get_objects_to_hash(self) -> list:
+    def get_objects_to_hash(self) -> list:
         """Return a list of objects which should be included in the node hash."""
         return [self._node.element, self._node.md5]
 

tests/data/pseudo/test_pseudo.py

@@ -233,4 +233,4 @@ def test_hash(stream, filename, element, are_equal):
     right.element = element
     right.store()
 
-    assert (left.base.caching.get_hash() == right.base.caching.get_hash()) is are_equal
+    assert (left.base.caching.compute_hash() == right.base.caching.compute_hash()) is are_equal