Merge pull request mautic#8591 from mautic/staging

Merge staging branch into release-2.16 for 2.16.1 release

Add hyphen to EXTRA_VERSION for beta

Merge branch 'release-3.0.0-beta' into 3.x

Merge pull request mautic#8440 from mautic/release-2.16

Release 2.16.0

Update generated assets

Removed Amsterdam note from README.md

Merge pull request mautic#7924 from mautic/release-2.15.3

Release 2.15.3

[TASK] Regenerate production assets

Merge pull request mautic#7744 from mautic/release-2.15.2

Release 2.15.2

Prevent an issue with installation and Mautibox for installations in …

…subdirectories (mautic#7572)

Prevent an issue with installation and Mautibox for installations in subdirectories