Fix PHPCS: missing use statement for Drupal\Core\Render\Markup in GeoPhpGeocodeFormatter [#3613790]

Problem/Motivation

phpcs fails on 8.x-4.x with Drupal.Classes.FullyQualifiedNamespace.UseStatementMissing in modules/geocoder_geofield/src/Plugin/Field/FieldFormatter/GeoPhpGeocodeFormatter.php — \Drupal\Core\Render\Markup::create() is referenced fully-qualified inline.

Steps to reproduce

Proposed resolution

Add use Drupal\Core\Render\Markup; and reference it as Markup::create() (matches phpcbf auto-fix).

Remaining tasks

User interface changes

API changes

Data model changes

Issue fork geocoder-3613790

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3613790-fix-phpcs-missing changes, plain diff MR !80
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