Bump nodenv/.github from 5 to 6

Bumps [nodenv/.github](https://github.com/nodenv/.github) from 5 to 6.
- [Release notes](https://github.com/nodenv/.github/releases)
- [Commits](nodenv/.github@v5...v6)

---
updated-dependencies:
- dependency-name: nodenv/.github
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/sync-default-branch.yml

@@ -7,7 +7,7 @@ permissions: {}
 jobs:
   sync:
     permissions: { contents: write }
-    uses: nodenv/.github/.github/workflows/sync-default-branch.yml@v5
+    uses: nodenv/.github/.github/workflows/sync-default-branch.yml@v6
 # One-time commands for users to switch-over:
 #
 # ```console