Update pnpm/action-setup action to v6 (#583)

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

Author: renovate[bot]

.github/workflows/build-and-test.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           node-version: "24.15"
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
         with:
           version: 8
           run_install: false
@@ -42,7 +42,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           node-version: "24.15"
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
         with:
           version: 8
           run_install: false