chore: add .nvmrc file for Node version management; update CI workflows to remove version specifications for pnpm and Node

.github/workflows/ci.yml

@@ -17,13 +17,9 @@ jobs:
 
       - name: Setup pnpm 🌟
         uses: pnpm/action-setup@v4
-        with:
-          version: latest
 
       - name: Setup Node 📦
         uses: actions/setup-node@v4
-        with:
-          node-version: latest
 
       - name: Install dependencies 📦
         run: pnpm install

.github/workflows/main.yml

@@ -29,13 +29,9 @@ jobs:
 
       - name: Setup pnpm 🌟
         uses: pnpm/action-setup@v4
-        with:
-          version: latest
 
       - name: Setup Node 📦
         uses: actions/setup-node@v4
-        with:
-          node-version: latest
 
       - name: Install dependencies 📦
         run: pnpm install

.nvmrc

@@ -0,0 +1 @@
+v22