ci: update GitHub Actions to use direct deno commands

- Change from deno task commands to direct deno commands
- Use deno fmt --check instead of deno task fmt --check
- Use deno lint instead of deno task lint
- Use deno check instead of deno task check

Author: wyattjoh

.github/workflows/publish.yml

@@ -24,13 +24,13 @@ jobs:
           deno-version: v2.x
 
       - name: Check formatting
-        run: deno task fmt --check
+        run: deno fmt --check
 
       - name: Lint code
-        run: deno task lint
+        run: deno lint
 
       - name: Type check
-        run: deno task check
+        run: deno check
 
       - name: Publish packages to JSR
         run: deno publish