Update torch+cpu version. (#4516)

Author: frjo

requirements/translate-cpu.txt

@@ -1,6 +1,6 @@
 # Requirements for machine translations, manually managed.
 
 # Only install the CPU version of torch when available (linux)
---find-links https://download.pytorch.org/whl/cpu/torch_stable.html
-torch==2.3.1+cpu
+--extra-index-url https://download.pytorch.org/whl/cpu
+torch==2.6.0+cpu
 argostranslate==1.9.6