Update pnpm/action-setup action to v5 (ember-cli#2629)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v6
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v5
       with:
         run_install: false
     - uses: actions/setup-node@v6
@@ -35,7 +35,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v5
       with:
         run_install: false
     - name: Use Node.js ${{ matrix.node-version }}

.github/workflows/publish.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v5
       - uses: actions/setup-node@v6
         with:
           node-version: 24