Fix php7.x install gearman issue

[samejack]

Description

Fixing the automatic upgrade to PHP 8.2 issue when Workspace specifies PHP 7.4 for Gearman installation.

Motivation and Context

Install package name php-gearman fixed to php7.x-gearman

Types of Changes

• Bug fix (non-breaking change which fixes an issue).
• [] New feature (non-breaking change which adds functionality).
• [] Breaking change (fix or feature that would cause existing functionality to not work as expected).

Definition of Done Checklist:

• I've read the Contribution Guide.
• I've updated the documentation. (refer to this for how to do so).
• I enjoyed my time contributing and making developer's life easier :)

[samejack]

Thanks