releaser: Add release notes for 0.58.2

[ci skip]

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+This is a bug-fix release with a couple of important fixes.
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+* Fix cache keys for bundled resoures in transform.Unmarshal [c0d75736](https://github.com/gohugoio/hugo/commit/c0d7573677e9726c14749ccd432dccb75e0d194d) [@bep](https://github.com/bep) [#6327](https://github.com/gohugoio/hugo/issues/6327)
+* filecache: Ignore "does not exist" errors in prune [fcfa6f33](https://github.com/gohugoio/hugo/commit/fcfa6f33bbebc128a3f9bc3162173bc3780c5f50) [@bep](https://github.com/bep) [#6326](https://github.com/gohugoio/hugo/issues/6326)[#5745](https://github.com/gohugoio/hugo/issues/5745)
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