Fix block scalar newline interpretation in release workflow

[adamtheturtle]

The previous fix used a YAML block scalar (|-) which doesn't interpret \n as newlines, causing literal \n to appear in CHANGELOG.rst. This fix uses a double-quoted string on a single line which correctly interprets escape sequences.

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Note

Fixes newline handling in the release workflow’s changelog update.

• In .github/workflows/release.yml, change Update changelog step replace value to a double-quoted single-line string so \n escape sequences render as real newlines in CHANGELOG.rst.
• No other workflow logic modified.

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