[doc] fix bug reporting url

README.md

@@ -134,8 +134,8 @@ Bugs
 
 Execo is regularly used to perform advanced experiments and
 administration / monitoring tasks, in and outside Grid5000. We
-actively fix bugs. Bugs should be reported to http://bugzilla.inria.fr
-(product: execo)
+actively fix bugs. Bugs should be reported to
+https://gitlab.inria.fr/mimbert/execo/-/issues
 
 Publications
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