ci: use canary Deno version for JSR publishing (#3710)

Mostly to quickly get updates and fixes like
denoland/deno#32127

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bartlomieju

.github/workflows/publish.yml

@@ -22,6 +22,7 @@ jobs:
         uses: denoland/setup-deno@v2
         with:
           cache: true
+          deno-version: canary
 
       - name: Install dependencies
         run: deno install