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After trying to upgrade the components using libxml2 I went back to just backporting minimal patches for the following reasons:

• mariadb 10.4 is EOL but we are not fully ready to use newer versions in ERP5.
• updating inkscape needs gcc > 10 but scipy py2 needs gcc < 10 and we do not have an easy way of using more than one gcc version in a software
• gdal is used only in an old projects still using python2, so updating it too early and depending on py3 seemed not usefull.
• I don't understand why this started to appear now, but libreoffice does not start because of a libc version mismatch, it was still using icu from the system, so this also includes a fix to use slapos' icu