fix: workflow fixes and vanitygen rebrand

Workflows:
- lock.yml: GH_PAT_BOT → github.token
- chain-endpoints.yml: repo name polkadot-js/apps → pezkuwichain/pezkuwi-apps
- test-nightly.yml: add 120min timeout
- auto-approve.yml: update token and authors
- auto-merge.yml: update token

Dependencies:
- @polkadot/vanitygen → @pezkuwi/vanitygen

.github/workflows/auto-merge.yml

@@ -13,4 +13,4 @@ jobs:
           checks: pr (build:code),pr (build:i18n),pr (build:electron),pr (lint),pr (test)
           labels: -auto
           strategy: squash
-          token: ${{ secrets.GH_PAT_BOT }}
+          token: ${{ github.token }}