Update deno.yml

Author: masx200

.github/workflows/deno.yml

@@ -29,7 +29,7 @@ jobs:
         # uses: denoland/setup-deno@v1
         uses: denoland/setup-deno@v1.1.0
         with:
-          deno-version: v1.x
+          deno-version: v1.20.4
 
       # Uncomment this step to verify the use of 'deno fmt' on each commit.
       # - name: Verify formatting