[Github] Add stefanp-synopsys to release uploaders

It seems stefanp-ibm got renamed to sefanp-synopsys. Renaming in the file so
that the release asset audit does not keep flagging this binary. All signs
point to this being the same account. The release is dated to June of 2024,
the name is close enough, and the new account is already in the LLVM org/
has a history of contributions.

This is a stop gap for #130650.

Author: boomanaiden154

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

@@ -24,7 +24,7 @@ def _get_uploaders(release_version):
         return set(
             [
                 "DimitryAndric",
-                "stefanp-ibm",
+                "stefanp-synopsys",
                 "lei137",
                 "omjavaid",
                 "nicolerabjohn",