[Github] Add stefanp-synopsys to release uploaders

Manual backport of df79276 to
release/20.x

Part of fixing #132738.

Author: boomanaiden154

.github/workflows/release-asset-audit.py

@@ -25,7 +25,7 @@ def main():
     uploaders = set(
         [
             "DimitryAndric",
-            "stefanp-ibm",
+            "stefanp-synopsys",
             "lei137",
             "omjavaid",
             "nicolerabjohn",