Update sdk_generator.py (Azure#32263)

fix python sdk generation problem

Author: tadelesh

tools/azure-sdk-tools/packaging_tools/sdk_generator.py

@@ -66,7 +66,7 @@ def after_multiapi_combiner(sdk_code_path: str, package_name: str, folder_name:
     # do not package code of v20XX_XX_XX
     exclude = lambda x: x.replace("-", ".") + ".v20*"
     if toml_file.exists():
-        with open(toml_file, "r") as file_in:
+        with open(toml_file, "rb") as file_in:
             content = toml.load(file_in)
         if package_name != "azure-mgmt-resource":
             content["packaging"]["exclude_folders"] = exclude(package_name)