Automated release Github upload fix (#2192)

## Issue Addressed

Our v1.1.0 automated release failed to upload to Github. The `hub` command failed with a `403`, which seems like this issue: https://github.com/github/hub/issues/2149
 
## Proposed Changes

The suggested fix in that issue is to set the `$GITHUB_USER` environment variable. I can't really test this because this hasn't been failing on my fork, but seems low risk



Co-authored-by: realbigsean <seananderson33@gmail.com>
Co-authored-by: Paul Hauner <paul@paulhauner.com>

.github/workflows/release.yml

@@ -227,6 +227,7 @@ jobs:
 
             - name: Create Release Draft
               env:
+                  GITHUB_USER: sigp
                   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
               # The formatting here is borrowed from OpenEthereum: https://github.com/openethereum/openethereum/blob/main/.github/workflows/build.yml