Boost: correct address model for "s390x" architecture (conan-io#25789)

* Update conanfile.py

Added "s390x" to the  _b2_address_model function to return "64".

* Launch CI again

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Co-authored-by: Luis Caro Campos <3535649+jcar87@users.noreply.github.com>

recipes/boost/all/conanfile.py

@@ -1181,7 +1181,7 @@ def _b2_os(self):
 
     @property
     def _b2_address_model(self):
-        if self.settings.arch in ("x86_64", "ppc64", "ppc64le", "mips64", "armv8", "armv8.3", "sparcv9"):
+        if self.settings.arch in ("x86_64", "ppc64", "ppc64le", "mips64", "armv8", "armv8.3", "sparcv9", "s390x"):
             return "64"
 
         return "32"