Support for European Sovereign Cloud (eusc-de-east-1)

[FlemmingBehrend]

Is your feature request related to a problem? Please describe.

When using the toolkit from an azure pipeline with a service connection using OIDC the sts endpoint that the toolkit uses is the wrong one. It points to sts.eusc-de-east-1.amazonaws.com and not .eu

Describe the solution you'd like

I like to have the toolkit support the new region in the European Sovereign Cloud (eusc-de-east-1)

Describe alternatives you've considered

N/A

Additional context

Logs:

at constructor.<anonymous> (/home/vsts/work/_tasks/AWSCLI_<TASK_ID>/1.24.0/AWSCLI.js:37:133950)
at constructor.callListeners (/home/vsts/work/_tasks/AWSCLI_<TASK_ID>/1.24.0/AWSCLI.js:37:97340)
at constructor.emit (/home/vsts/work/_tasks/AWSCLI_<TASK_ID>/1.24.0/AWSCLI.js:37:97048)
at constructor.emitEvent (/home/vsts/work/_tasks/AWSCLI_<TASK_ID>/1.24.0/AWSCLI.js:38:28344)
at u (/home/vsts/work/_tasks/AWSCLI_<TASK_ID>/1.24.0/AWSCLI.js:37:130543)
at ClientRequest.<anonymous> (/home/vsts/work/_tasks/AWSCLI_<TASK_ID>/1.24.0/AWSCLI.js:61:16997)
at ClientRequest.emit (node:events:524:28)
at ClientRequest.emit (node:domain:489:12)
at emitErrorEvent (node:_http_client:101:11)
at TLSSocket.socketErrorListener (node:_http_client:504:5) {
code: 'UnknownEndpoint',
region: 'eusc-de-east-1',
hostname: 'sts.eusc-de-east-1.amazonaws.com'