Disable Go cache in release workflow

No external dependencies, so caching is unnecessary and
was producing a warning about missing go.sum.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: yepzdk

.github/workflows/release.yaml

@@ -19,6 +19,7 @@ jobs:
         uses: actions/setup-go@v5
         with:
           go-version: '1.21'
+          cache: false  # No external dependencies
 
       - name: Build binaries
         run: make build-all