AWS AppConfig Deprecated API

[thnk2wn]

It looks like the appconfig provider uses the GetConfiguration API Action that was deprecated in January 2022.

Recommended actions are StartConfigurationSession and GetLatestConfiguration

Attempting to use returned error not found, ResolveEndpointV2 though I can't be sure that's due to the deprecation.

In either case, it probably makes sense to move off the deprecated AWS API. I might be able to look at a PR later.

[knadh]

Ah, was unaware of this. Looking forward to the PR. Thank you.

[thnk2wn]

@knadh #313

Ran an integration test against our account and it worked fine but I haven't done extensive testing yet.

• Note it's a breaking change with removing ClientID. Could be kept and mark deprecated but no longer used with latest API.
• Not sure about contributions and guidelines in this repo. Happy to use our forked version or make tweaks to this but feel free to also just reference this PR if further changes are needed.