[Ubuntu] MapServer 7.4.4 Security release

[Sebastiaan Couwenberg]

MapServer 7.4.4 has been released, this is a security release that fixes
PHPMapScript vulnerabilities in error handling, see:

 https://github.com/mapserver/mapserver/issues/6014

Fixed packages have been uploaded to Debian unstable & buster-backports,
the package in UbuntuGIS needs to be updated too.

Note that it only affects php-mapscript, not php-mapscript-ng. So if
that isn't built, like it is in for 7.2 in buster for example, there is
no urgency to update the package.

Kind Regards,

Bas

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