[ruby-list:50924] [ANN] Ruby 3.0.1, 2.7.3. 2.6.7 and 2.5.9 Released

[U.NAKAMURA]

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* [Ruby 3.0.1 Released](https://www.ruby-lang.org/en/news/2021/04/05/ruby-3-0-1-released/)
* [Ruby 2.7.3 Released](https://www.ruby-lang.org/en/news/2021/04/05/ruby-2-7-3-released/)
* [Ruby 2.6.7 Released](https://www.ruby-lang.org/en/news/2021/04/05/ruby-2-6-7-released/)
* [Ruby 2.5.9 Released](https://www.ruby-lang.org/en/news/2021/04/05/ruby-2-5-9-released/)


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* [CVE-2021-28965: XML round-trip vulnerability in REXML](https://www.ruby-lang.org/en/news/2021/04/05/xml-round-trip-vulnerability-in-rexml-cve-2021-28965/)
* [https://www.ruby-lang.org/en/news/2021/04/05/tempfile-path-traversal-on-windows-cve-2021-28966/)

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