[CI] Fix integration test credentials

[jlizen]

The GitHub organization move seems to have scrambled our integration test perms, which run against a real AWS account.

Sample failure:
https://github.com/aws/aws-lambda-rust-runtime/actions/runs/20281348325/job/58243876894

1m 36s
Run aws-actions/configure-aws-credentials@v4.0.2
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Error: Could not assume role with OIDC: Not authorized to perform sts:AssumeRoleWithWebIdentity
Run aws-actions/configure-aws-credentials@v4.0.2
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Assuming role with OIDC
Error: Could not assume role wit

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