news: add entry for syslog-ng#4666

Signed-off-by: Attila Szakacs <[email protected]>

news/other-4666.md

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+templates: The `template-escape()` option now only escapes the top-level template function.
+
+Before syslog-ng 4.5.0 if you had embedded template functions, the `template-escape(yes)` setting
+escaped the output of each template function, so the parent template function received an
+already escaped string. This was never the intention of the `template-escape()` option.
+
+Although this is a breaking change, we do not except anyone having a config that is affected.
+If you have such a config, make sure to follow-up this change. If you need help with it, feel
+free to open an issue or discussion on GitHub, or contact us on the Axoflow Discord server.