docs(release): generate 3.9.3 changelog (#14911)

* docs(release): generate 3.9.3 changelog

* Apply suggestion from @lena-larionova

Co-authored-by: lena-larionova <54370747+lena-larionova@users.noreply.github.com>

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Co-authored-by: Michael Xiong <michael.xiong@konghq.com>
Co-authored-by: lena-larionova <54370747+lena-larionova@users.noreply.github.com>

Author: 3 people

changelog/3.9.3/3.9.3.md

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+## Kong
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+### Fixes
+#### Core
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+- Applied upstream nginx security patches for limiting the maximum number of headers (CVE-2026-49975).
+ [#14895](https://github.com/Kong/kong/issues/14895)
+ [KAG-9189](https://konghq.atlassian.net/browse/KAG-9189)