[RCU] Update 1.5.3 released

[Thomas Bruederli]

Dear subscribers

We just published the third service release to update the stable version
1.5. It provides a bunch of small fixes and improvements for the PHP8
compatibility. See the full changelog in the release notes on the Github
download page: https://github.com/roundcube/roundcubemail/releases/tag/1.5.3

This release is considered stable and we recommend to update all productive
installations of Roundcube with this version. Download it from
https://roundcube.net/download.
Please do backup your data before updating!

Kind regards
Thomas & Alec
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