Use literal block scalar for changelog replace string

[adamtheturtle]

Use literal block scalar (|) with actual newlines instead of escape sequences in the release workflow. This fixes zizmor warnings while being compatible with yamlfix.

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Note

Adjusts the release workflow’s changelog update to use a multi-line YAML block scalar for replace, ensuring real newlines instead of escaped sequences.

• In release.yml, changes replace for gha-find-replace to a literal block with the Next header and interpolated release/underline values

^{Written by Cursor Bugbot for commit 88e7050. This will update automatically on new commits. Configure here.}