Bump hashicorp/vault-action from 2.5.0 to 3.1.0

Bumps [hashicorp/vault-action](https://github.com/hashicorp/vault-action) from 2.5.0 to 3.1.0.
- [Release notes](https://github.com/hashicorp/vault-action/releases)
- [Changelog](https://github.com/hashicorp/vault-action/blob/main/CHANGELOG.md)
- [Commits](hashicorp/vault-action@v2.5.0...v3.1.0)

---
updated-dependencies:
- dependency-name: hashicorp/vault-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/backend_checks.yml

@@ -451,7 +451,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Get Vault Token
-        uses: hashicorp/vault-action@v2.5.0
+        uses: hashicorp/vault-action@v3.1.0
         with:
           url: ${{ secrets.VAULT_ADDR }}
           namespace: ${{ secrets.VAULT_NAMESPACE }}