docs: add changelog entry for 5.0.0

- grease bug: no changelog entry generated when 0 commits found in range

Signed-off-by: Lexus Drumgold <unicornware@flexdevelopment.llc>

Author: unicornware

CHANGELOG.md

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+## [5.0.0](https://github.com/flex-development/log/compare/5.0.0-alpha.7...5.0.0) (2025-08-30)
 
 ## [5.0.0-alpha.7](https://github.com/flex-development/log/compare/5.0.0-alpha.6...5.0.0-alpha.7) (2025-08-30)
 
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 - [[`dca1a84`](https://github.com/flex-development/log/commit/dca1a841b524fb56568d7454886d0c656b970a5f)] change project name
 - [[`020dee5`](https://github.com/flex-development/log/commit/020dee5fdcd6af4f371fc8dd4a9bdb73a5aaff65)] **release:** update workflow
 - [[`5dcee7f`](https://github.com/flex-development/log/commit/5dcee7fd74df2b20241b088d98040fa1f67f95cf)] **scripts:** update `release` script
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