releaser: Add release notes for 0.84.3

[ci skip]

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+This is a bug-fix release with a couple of important fixes.
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+* config: Fix Netlify default cache dir logic [6c8c0c8b](https://github.com/gohugoio/hugo/commit/6c8c0c8b6a0b39b91de44d72a7bd1cd49534a0f1) [@bep](https://github.com/bep) [#8710](https://github.com/gohugoio/hugo/issues/8710)
+* config: Fix handling of invalid OS env config overrides [49fedbc5](https://github.com/gohugoio/hugo/commit/49fedbc51cafa64e4eb0eae9fb79ccbe2d4c6774) [@bep](https://github.com/bep) [#8709](https://github.com/gohugoio/hugo/issues/8709)
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