releaser: Add release notes for 0.91.2

[ci skip]

Author: bep

temp/0.91.2-relnotes-ready.md

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+This is a bug-fix release with a couple of important fixes.
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+* Revert "config/security: Add HOME to default exec env var whitelist" 623dda71 [@bep](https://github.com/bep) 
+* Make sure we always create the /public folder aee9e11a [@bep](https://github.com/bep) #8166 
+* Fix "stuck on build" in error situations in content processing bd63c1aa [@bep](https://github.com/bep) #8166 
+* deps: Run "go mod tidy" 9eb05807 [@bep](https://github.com/bep) 
+* deps: Upgrade github.com/evanw/esbuild v0.14.7 => v0.14.8 654f513a [@bep](https://github.com/bep) 
+* releaser: Prepare repository for 0.92.0-DEV 759cdf3f [@bep](https://github.com/bep) 
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