chore(deps): bump actions/setup-node from 2.pre.beta to 6.4.0

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 2.pre.beta to 6.4.0.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v2-beta...v6.4.0)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: 6.4.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/closed_references.yml

@@ -20,7 +20,7 @@ jobs:
     name: Find closed references
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2-beta
+      - uses: actions/setup-node@v6.4.0
         with:
           node-version: "14"
       - uses: ory/closed-reference-notifier@v1