update-python-libraries: migrate git revs to use tag

pkgs/by-name/up/update-python-libraries/update-python-libraries.py

@@ -486,7 +486,7 @@ def _update_package(path, target):
     if fetcher == "fetchFromGitHub":
         # in the case of fetchFromGitHub, it's common to see `rev = version;` or `rev = "v${version}";`
         # in which no string value is meant to be substituted. However, we can just overwrite the previous value.
-        regex = r"(rev\s+=\s+[^;]*;)"
+        regex = r"((?:rev|tag)\s+=\s+[^;]*;)"
         regex = re.compile(regex)
         matches = regex.findall(text)
         n = len(matches)
@@ -496,7 +496,7 @@ def _update_package(path, target):
         else:
             # forcefully rewrite rev, incase tagging conventions changed for a release
             match = matches[0]
-            text = text.replace(match, f'rev = "refs/tags/{prefix}${{version}}";')
+            text = text.replace(match, f'tag = "{prefix}${{version}}";')
             # incase there's no prefix, just rewrite without interpolation
             text = text.replace('"${version}";', "version;")