ci: use .nvmrc for Node.js version in CI workflows

Replace hardcoded node-version values (20.x, lts/*) with
node-version-file referencing .nvmrc, ensuring all CI jobs use the
same Node.js version pinned in the repository.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: dhensby

.github/workflows/release.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v5
         with:
-          node-version: 20.x
+          node-version-file: '.nvmrc'
           cache: 'npm'
       - name: Install dependencies
         run: npm clean-install
@@ -43,7 +43,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v5
         with:
-          node-version: 20.x
+          node-version-file: '.nvmrc'
           cache: 'npm'
       - name: Install dependencies
         run: npm clean-install
@@ -60,7 +60,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v5
         with:
-          node-version: 20.x
+          node-version-file: '.nvmrc'
           cache: 'npm'
       - name: Install dependencies
         run: npm clean-install
@@ -83,7 +83,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v5
         with:
-          node-version: 20.x
+          node-version-file: '.nvmrc'
           cache: 'npm'
       - name: Install dependencies
         run: npm clean-install
@@ -106,7 +106,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v5
         with:
-          node-version: 20.x
+          node-version-file: '.nvmrc'
           cache: 'npm'
       - name: Install deps
         run: npm ci
@@ -164,7 +164,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v5
         with:
-          node-version: "lts/*"
+          node-version-file: '.nvmrc'
           cache: 'npm'
       - name: Install dependencies
         run: npm clean-install