upgrade graal dependency

Author: tomasstupka

mx.fastr/suite.py

@@ -8,7 +8,7 @@
                "name" : "truffle",
                "subdir" : True,
                # The version must be the same as the version of Sulong
-               "version" : "27dd83d19f40bbbd435d9b0a63239875b54fc628",
+               "version" : "b2ec61658947a4276148438d403ae266345d6ce5",
                "urls" : [
                     {"url" : "https://github.com/graalvm/graal", "kind" : "git"},
                     {"url" : "https://curio.ssw.jku.at/nexus/content/repositories/snapshots", "kind" : "binary"},
@@ -18,7 +18,7 @@
                "name" : "sulong",
                "subdir" : True,
                # The version must be the same as the version of Truffle
-               "version" : "27dd83d19f40bbbd435d9b0a63239875b54fc628",
+               "version" : "b2ec61658947a4276148438d403ae266345d6ce5",
                "urls" : [
                     {"url" : "https://github.com/graalvm/graal", "kind" : "git"},
                     {"url" : "https://curio.ssw.jku.at/nexus/content/repositories/snapshots", "kind" : "binary"},