Bug 1716619 - update dump_syms to get symbolic fix. r=calixte

Differential Revision: https://phabricator.services.mozilla.com/D118166

taskcluster/ci/fetch/toolchains.yml

@@ -516,7 +516,7 @@ dump-syms:
     fetch:
         type: git
         repo: https://github.com/mozilla/dump_syms/
-        revision: 3cfe1848ad3247890715168a7175260abe6f96bc
+        revision: be751e1cd3a9ecf46227adc789f1239de53fe4d6
 
 fix-stacks:
     description: fix-stacks source code