fix(release): use env context instead of secrets in if condition

secrets context is not allowed in step-level if expressions. Reference
the already-mapped env.HOMEBREW_TAP_TOKEN instead.

Author: axot

.github/workflows/release.yml

@@ -145,7 +145,7 @@ jobs:
             OpenSuperMLX.dmg.sha256
 
       - name: Update Homebrew tap
-        if: ${{ secrets.HOMEBREW_TAP_TOKEN != '' }}
+        if: ${{ env.HOMEBREW_TAP_TOKEN != '' }}
         env:
           HOMEBREW_TAP_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
         run: |