releaser: Add release notes for 0.86.1

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+This is a bug-fix release with one important fix.
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+* config: Fix a potential deadlock in config reading [94b616bd](https://github.com/gohugoio/hugo/commit/94b616bdfad177daa99f5e87535943f509198f6f) [@bep](https://github.com/bep) [#8791](https://github.com/gohugoio/hugo/issues/8791)
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