Remove setup-node from CI jobs

Node 20 is already in the node:20-bookworm runner image; setup-node
was hanging ~5min trying to reach an unconfigured npm cache service.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.forgejo/workflows/deploy.yml

@@ -35,12 +35,6 @@ jobs:
             - name: ⬇️ Checkout repo
               uses: https://github.com/actions/checkout@v4
 
-            - name: ⎔ Setup node
-              uses: https://github.com/actions/setup-node@v4
-              with:
-                  node-version-file: '.nvmrc'
-                  cache: 'npm'
-
             - name: 📥 Install dependencies
               run: npm ci
 
@@ -58,12 +52,6 @@ jobs:
             - name: ⬇️ Checkout repo
               uses: https://github.com/actions/checkout@v4
 
-            - name: ⎔ Setup node
-              uses: https://github.com/actions/setup-node@v4
-              with:
-                  node-version-file: '.nvmrc'
-                  cache: 'npm'
-
             - name: 📥 Install dependencies
               run: npm ci
 
@@ -78,12 +66,6 @@ jobs:
             - name: ⬇️ Checkout repo
               uses: https://github.com/actions/checkout@v4
 
-            - name: ⎔ Setup node
-              uses: https://github.com/actions/setup-node@v4
-              with:
-                  node-version-file: '.nvmrc'
-                  cache: 'npm'
-
             - name: 📥 Install dependencies
               run: npm ci