Fix bytecode for Python 3.12

`LOAD_ATTR` has been changed in Python 3.12 and it seems reusing the
`LOAD_GLOBAL` logic makes the simple tests passing.

I am not sure if this is correct since I'm pretty new to the code, but
maybe it's still helpful.

js2py/translators/translating_nodes.py

@@ -543,7 +543,7 @@ def TryStatement(type, block, handler, handlers, guardedHandlers, finalizer):
     if handler:
         identifier = handler['param']['name']
         holder = 'PyJsHolder_%s_%d' % (to_hex(identifier),
-                                       random.randrange(1e8))
+                                       random.randrange(six.integer_types[-1](1e8)))
         identifier = repr(identifier)
         result += 'except PyJsException as PyJsTempException:\n'
         # fill in except ( catch ) block and remember to recover holder variable to its previous state

js2py/utils/injector.py

@@ -14,6 +14,7 @@
 # Opcode constants used for comparison and replacecment
 LOAD_FAST = opcode.opmap['LOAD_FAST']
 LOAD_GLOBAL = opcode.opmap['LOAD_GLOBAL']
+LOAD_ATTR = opcode.opmap['LOAD_ATTR']
 STORE_FAST = opcode.opmap['STORE_FAST']
 
 
@@ -79,6 +80,7 @@ def append_arguments(code_obj, new_locals):
         (co_names.index(name), varnames.index(name)) for name in new_locals)
 
     is_new_bytecode = sys.version_info >= (3, 11)
+    is_new_load_attr = sys.version_info >= (3, 12)
     # Now we modify the actual bytecode
     modified = []
     drop_future_cache = False
@@ -97,7 +99,7 @@ def append_arguments(code_obj, new_locals):
         # it's one of the globals that we are replacing. Either way,
         # update its arg using the appropriate dict.
         drop_future_cache = False
-        if inst.opcode == LOAD_GLOBAL:
+        if inst.opcode == LOAD_GLOBAL or is_new_load_attr and inst.opcode == LOAD_ATTR:
             idx = inst.arg
             if is_new_bytecode:
                 idx = idx // 2