Deregister an alias for a specific tool.

        Args:
            context_name (str): Context containing the tool.
            tool_name (str): Name of tool to unalias.

def unalias_tool(self, context_name, tool_name):
        """Deregister an alias for a specific tool.

        Args:
            context_name (str): Context containing the tool.
            tool_name (str): Name of tool to unalias.
        """
        data = self._context(context_name)
        aliases = data["tool_aliases"]
        if tool_name in aliases:
            del aliases[tool_name]
            self._flush_tools()