autobk: e0 has been replaced by ek0 but treatments seems to be the exact same (for now)

relevant commit on xray-larch side is: https://github.com/xraypy/xraylarch/commit/6f40332497895ac1884dbeab16922271539e01a9

date: 24june 2023 -> upgrade dependancy to 0.9.71

setup.cfg

@@ -57,7 +57,7 @@ ewoks.tasks.class =
 pymca =
     pymca >=5.8.1
 larch =
-    xraylarch >=0.9.67
+    xraylarch >=0.9.71
 orange =
     Orange3
 full =

src/est/core/process/larch/autobk.py

@@ -79,10 +79,11 @@ def process_spectr_autobk(
         mu=spectrum.mu,
         group=res_group,
         edge_step=spectrum.edge_step,
-        e0=spectrum.e0,
+        ek0=spectrum.e0,
         **opts
     )
-    spectrum.e0 = res_group.e0
+    # on the spectrum object e0 == ek0
+    spectrum.e0 = res_group.ek0
     spectrum.chi = res_group.chi
     spectrum.k = res_group.k
     spectrum.larch_dict["bkg"] = res_group.bkg