Set amavis group for 50-user to make it readable in Debian 11

Closes #6237

See merge request ispconfig/ispconfig3!1530

Update jQuery

See merge request ispconfig/ispconfig3!1535

6163 confidential issue

See merge request ispconfig-confidential/ispconfig3!5

Resolve "3.2.7: remote api login fails if restricted by remote_ips"

Closes #6244

See merge request ispconfig/ispconfig3!1534

Improve API security

See merge request ispconfig/ispconfig3!1533

Resolve "installer certificate symlink handling"

Closes #6238

See merge request ispconfig/ispconfig3!1527

Merge branch 'develop' of git.ispconfig.org:ispconfig-confidential/ispconfig3 into confidential-develop

Resolve "php 5.4 incompatibility array_column"

Closes #6231

See merge request ispconfig/ispconfig3!1524

Pre-Release 3.2.6

See merge request ispconfig/ispconfig3!1523

Resolve "Duplicate forwards must be allowed, revert for #6212"

Closes #6229

See merge request ispconfig/ispconfig3!1522

Fixed: Rewrite proxy for ssl targets

See merge request ispconfig/ispconfig3!1521

6181-fix-fpm-socket-dir:  Fix socket dir for additional php versions

Closes #6181

See merge request ispconfig/ispconfig3!1490

Add api functions for DNS type LOC, #6224

Closes #6224

See merge request !1519

Limit email backup tab through client limits (#5732)

Closes #5732

See merge request ispconfig/ispconfig3!1250

# Conflicts:
#   install/sql/incremental/upd_dev_collection.sql
#   install/sql/ispconfig3.sql
#   interface/web/client/form/client.tform.php
#   interface/web/client/form/client_template.tform.php
#   interface/web/client/form/reseller.tform.php
#   interface/web/client/lib/lang/br_client.lng
#   interface/web/client/lib/lang/br_client_template.lng
#   interface/web/client/lib/lang/br_reseller.lng
#   interface/web/client/templates/client_edit_limits.htm
#   interface/web/client/templates/client_template_edit_limits.htm
#   interface/web/client/templates/reseller_edit_limits.htm