releaser: Add release notes for 0.68.2

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+This is a bug-fix release with one important fix.
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+* Fix cache reset for a page's collections on server live reload [cfa73050](https://github.com/gohugoio/hugo/commit/cfa73050a49b2646fe3557cefa0ed31989b0eeeb) [@bep](https://github.com/bep) [#7085](https://github.com/gohugoio/hugo/issues/7085)
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