Enable support for guzzle 8

[pascalheidmann]

Description

Allow guzzle 8

Motivation and Context

Continuous modernization and requirement to be able to update other packages

How Has This Been Tested?

Automatic tests

Example Output or Screenshots (if appropriate):

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 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 read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Sidenote: as this library only supports PHP 8.1 and newer we might be able to drop Guzzle 6 support altogether as it is officially only compatible with PHP < 8.0.

[vonage-ai-assistant]

AI Adoption Report

	Lines	%
AI-generated	0	0%
Human	0	100%
Untracked	4	—
Total	4

Per-commit breakdown (1 commits)

Commit	Message	Added	AI	Human	AI %
612669d	Enable support for guzzle 8	4	—	—	untracked

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• 612669d Enable support for guzzle 8

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[pascalheidmann]

@manchuck any chance this can be merged soon and released?