Support latest guzzle promises

[GrahamCampbell]

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[GrahamCampbell]

Support for super old and insecure versions of PHP is becoming quite problematic. Would AWS consider dropping PHP older than 7.2.5 on 30th June 2024 (or before this date) in order to be compatible with newer versions of Guzzle packages. Without doing this, soon, the AWS SDK may not actually be able to run on the latest versions of PHP nor on the latest Guzzle dependencies, due to the fact that PHP 8.3, 8.4, etc. support will not be introduced in EOL Guzzle dependencies. As a Guzzle maintainer, I take care to support old PHP versions longer than most, but there is a limit on how far Guzzle should do this, free of charge. Bug fix support for all Guzzle code that runs on PHP earlier than 7.2.5 has either already ended or will end soon, and similarly for security support:

• guzzlehttp/guzzle v6 bug fix support has ended already and security support will end on 30th June 2024.
• guzzlehttp/psr7 v1 bug fix support has ended already and security support will end on 30th June 2024.
• guzzlehttp/promises v1 bug fix support will end on 31st December 2023 and security support will end on 30th June 2024.

Looking at the install metrics, it doesn't look like dropping PHP older than 7.2.5 would have too much of an impact, especially since people can keep using the older SDK version (which I would assume they have no problem with, given they are also using super old EOL PHP):

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Another related issue: #2681.

[SamRemis]

Hi Graham,
We announced dropping support for versions below 7.2.5 in February which will be effective on August 15th, 2023. Totally agree with you here.

Please feel free to chime in or comment on the Github Discussion: #2638

[GrahamCampbell]

Excellent news. 🎉

[bmckay959]

I'm also running into the issue mention in #2681

Is there a recommended fix in the meantime before August 15th?

[GrahamCampbell]

You need to upgrade to the very latest version of this SDK, which may result in other packages begin downgraded, but if you do that, the SDK will work properly.