Replace mise-action with pnpm/action-setup + setup-node

No reason to install the full mise toolchain just to run pnpm publish.

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

Author: stevelandeydescript

.github/workflows/publish.yml

@@ -14,9 +14,10 @@ jobs:
         environment: Publish
         steps:
             - uses: actions/checkout@v4
-            - uses: jdx/mise-action@v2
+            - uses: pnpm/action-setup@v4
             - uses: actions/setup-node@v4
               with:
+                  node-version: '22'
                   registry-url: https://registry.npmjs.org
             - run: pnpm install
             - run: pnpm run build