Update dataset URL from S3 to Zenodo

The original dataset was updated from S3 to Zenodo as per the commit : https://github.com/microsoft/CodeXGLUE/commit/b8590790716d3251a6950e860cd43fd82f5a35a6
This PR updates the URL to the new link.

code_search_net.py

@@ -49,13 +49,14 @@ _HOMEPAGE = "https://github.com/github/CodeSearchNet"
 
 _LICENSE = "Various"
 
-_S3_BUCKET_URL = "https://s3.amazonaws.com/code-search-net/CodeSearchNet/v2/"
+# URL to dataset updated as per commit:
+# https://github.com/microsoft/CodeXGLUE/commit/b8590790716d3251a6950e860cd43fd82f5a35a6
+_ZENODO_URL = "https://zenodo.org/record/7857872/files/"
 _AVAILABLE_LANGUAGES = ["python", "java", "javascript", "go", "ruby", "php"]
-_URLs = {language: _S3_BUCKET_URL + f"{language}.zip" for language in _AVAILABLE_LANGUAGES}
+_URLs = {language: _ZENODO_URL + f"{language}.zip" for language in _AVAILABLE_LANGUAGES}
 # URLs for "all" are just the concatenation of URLs for all languages
 _URLs["all"] = _URLs.copy()
 
-
 class CodeSearchNet(datasets.GeneratorBasedBuilder):
     """ "CodeSearchNet corpus: proxy dataset for semantic code search."""