fix: use GH_PAT for release workflow push permissions

[Slokh]

Uses GH_PAT secret for push permissions in the release workflow. The default GITHUB_TOKEN lacks write access for peter-evans/create-pull-request to push the release branch.

Fixes: https://github.com/tempoxyz/changelogs/actions/runs/23213894536

[github-actions]

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changelogs: patch
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Fixed release workflow permissions by replacing the default `GITHUB_TOKEN` with a personal access token (`GH_PAT`) for checkout and release steps to enable push access.

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