fix script

Author: cometkim

.github/workflows/prepare_package_upload.js

@@ -11,11 +11,11 @@ const commitHash = process.argv[2] || process.env.GITHUB_SHA;
 const commitHashShort = commitHash.substring(0, 7);
 
 fs.renameSync(
-  `rescript-${version}.tgz`,
+  "package.tgz",
   `rescript-${version}-${commitHashShort}.tgz`,
 );
 fs.renameSync(
-  `packages/std/rescript-std-${version}.tgz`,
+  "packages/std/package.tgz",
   `rescript-std-${version}-${commitHashShort}.tgz`,
 );