core Drop PHP 7.3

Description

This is a PoC demonstrating the changes needed to drop PHP 7.3

composer found the following dependencies that it could update:

Installing dependencies from lock file (including require-dev)
Verifying lock file contents can be installed on current platform.
Package operations: 0 installs, 5 updates, 2 removals
  - Removing laminas/laminas-zendframework-bridge (1.4.1)
  - Removing container-interop/container-interop (1.2.0)
  - Upgrading psr/container (1.1.1 => 1.1.2): Extracting archive
  - Upgrading laminas/laminas-servicemanager (3.7.0 => 3.16.0): Extracting archive
  - Upgrading laminas/laminas-validator (2.19.0 => 2.23.0): Extracting archive
  - Upgrading laminas/laminas-filter (2.12.0 => 2.17.0): Extracting archive
  - Upgrading laminas/laminas-inputfilter (2.12.1 => 2.19.1): Extracting archive

Other things that could be done are:

bump from phpunit v9 to v10 (if phpunit v10 gets released "soon")
bump Symfony v4 to v5
check other major versions of dependencies in composer.json and see what could be updated

Related Issue

How Has This Been Tested?

CI

Types of changes

[ ] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Database schema changes (next release will require increase of minor version instead of patch)
[ ] Breaking change (fix or feature that would cause existing functionality to change)
[ ] Technical debt
[ ] Tests only (no source changes)

Checklist:

[ ] Code changes
[ ] Unit tests added
[ ] Acceptance tests added
[ ] Documentation ticket raised:
[ ] Changelog item, see TEMPLATE

The previous PR was #40122

Jul 28 '22 10:07 phil-davis

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.