Fix goreleaser failure: use github.token and add replace_existing_draft

The goreleaser workflow was failing with:
  PATCH .../releases/343427697: 404 Not Found

Root cause: The GORELEASER_GITHUB_TOKEN lacks write permission to
update releases in auth0/auth0-cli (GitHub returns 404 instead of 403
for security). This manifests when a release is pre-created before
goreleaser runs.

Fix:
- Use github.token (has contents:write from workflow permissions) for
  goreleaser's GITHUB_TOKEN so it always has permission to create and
  update releases in auth0/auth0-cli
- Add release.replace_existing_draft: true to .goreleaser.yml to
  handle stale draft releases from previous failed attempts

The downstream homebrew/scoop steps use explicit token: parameters
(not the GITHUB_TOKEN env var), so they are unaffected by this change.

Author: Copilot

.github/workflows/release.yml

@@ -31,7 +31,7 @@ jobs:
           args: release --clean
           workdir: 'auth0-cli'
         env:
-          GITHUB_TOKEN: ${{ secrets.GORELEASER_GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ github.token }}
           SENTRY_DSN: ${{ secrets.SENTRY_DSN }}
 
       # Homebrew Tap Process

.goreleaser.yml

@@ -32,6 +32,8 @@ snapshot:
   version_template: "{{ .Tag }}-SNAPSHOT-{{.ShortCommit}}"
 changelog:
   disable: true
+release:
+  replace_existing_draft: true
 brews:
   - name: auth0
     repository: