chore(deps): bump ikalnytskyi/action-setup-postgres from 6 to 8

Bumps [ikalnytskyi/action-setup-postgres](https://github.com/ikalnytskyi/action-setup-postgres) from 6 to 8.
- [Release notes](https://github.com/ikalnytskyi/action-setup-postgres/releases)
- [Commits](https://github.com/ikalnytskyi/action-setup-postgres/compare/v6...v8)

---
updated-dependencies:
- dependency-name: ikalnytskyi/action-setup-postgres
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/backend-test-windows.yml

@@ -40,7 +40,7 @@ jobs:
           ./backend/substitute_ee_code.sh --copy --dir ./windmill-ee-private
 
       - name: Setup PostgreSQL
-        uses: ikalnytskyi/action-setup-postgres@v6
+        uses: ikalnytskyi/action-setup-postgres@v8
         with:
           username: postgres
           password: changeme

.github/workflows/cli-tests.yml

@@ -129,7 +129,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup PostgreSQL
-        uses: ikalnytskyi/action-setup-postgres@v6
+        uses: ikalnytskyi/action-setup-postgres@v8
         with:
           username: postgres
           password: changeme