Update pnpm/action-setup action to v6

Author: renovate[bot]

.github/workflows/dependabot-alert-bridge-security-updates.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
 
       - uses: actions/setup-node@v6
         with:

.github/workflows/lint-and-check-types.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
       - name: Use Node.js
         uses: actions/setup-node@v6
         with: