Bump minimal PHP version to 8.3

[zero2one]

Description

Update the minimal PHP version to 8.3 as it is the least version we want to support.
Updated the PHPUnit tests so they use attributes instead of annotations.

Motivation and Context

Update package for future use.

How Has This Been Tested?

• All unit tests must pass.
• Example code has been tested against endpoint.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Documentation update.
• Breaking change (fix or feature that would cause existing functionality to change).

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have updated the CHANGELOG accordingly.
• I have read the CONTRIBUTING document.

[github-actions]

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