chore(deps): bump setup-node action to 6.4.0

Bumps actions/setup-node to v6.4.0 in the release workflow and updates the inline major-version comment.

Author: dependabot[bot]

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           bun-version: "1.3.14"
 
-      - uses: actions/setup-node@39370e3970a6d050c480ffad4ff0ed4d3fdee5af # v4
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
         with:
           node-version: "22"
           registry-url: "https://registry.npmjs.org"