Changelog entries related to 'drop PHP 7.0'

[phil-davis]

Description

Add changelogs for the things merged in #36290

• drop PHP 7.0 support
• MariaDb 10.3 support
• PostgreSQL 10 support

Related Issue

#29483 MariaDB
#33187 PostgreSQL 10
#36290 Drop PHP 7.0

How Has This Been Tested?

N/A

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

[codecov]

Codecov Report

Merging #36491 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #36491   +/-   ##
=========================================
  Coverage     64.68%   64.68%           
  Complexity    19023    19023           
=========================================
  Files          1268     1268           
  Lines         74362    74362           
  Branches       1309     1309           
=========================================
  Hits          48100    48100           
  Misses        25876    25876           
  Partials        386      386

Flag	Coverage Δ	Complexity Δ
#javascript	54% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.86% <ø> (ø)	19023 <ø> (ø)	⬇️

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