Don't use AWS region name for staging upload

This change removes the region name from the
upload-assets-to-staging.sh script, as AWS region names don't match the
CloudFlare ones.

Main repo PR: duckdb/duckdb#19551

Author: staticlibs

scripts/upload-assets-to-staging.sh

@@ -61,5 +61,5 @@ fi
 
 for var in "${@: 2}"
 do
-    aws s3 cp $var s3://duckdb-staging/$TARGET/$GITHUB_REPOSITORY/$FOLDER/ $DRY_RUN_PARAM --region us-east-2
+    aws s3 cp $var s3://duckdb-staging/$TARGET/$GITHUB_REPOSITORY/$FOLDER/ $DRY_RUN_PARAM
 done