fix: add STS dependency for IRSA credential resolution in EKS

[lidiams96]

Environment

• Jenkins Version: 2.479.3 (production EKS deployment)
• Plugin Version: latest main (post PR feat: add AWS Bedrock provider #95 merge)
• Java Version: 17
• Infrastructure: AWS EKS with IRSA (IAM Roles for Service Accounts)

Steps to Reproduce

1. Deploy Jenkins on AWS EKS with IRSA configured for the Jenkins pod's service account
2. Install the plugin and configure the Bedrock provider
3. Click "Test Configuration" or trigger explainError() on a failed build
4. The plugin uses the EKS node role instead of the pod's service account IAM role

Expected Behavior

The plugin should use the pod's IRSA credentials (via AssumeRoleWithWebIdentity) to authenticate with AWS Bedrock, inheriting the IAM role associated with the Kubernetes service account.

Actual Behavior

User: arn:aws:sts::ACCOUNT:assumed-role/prod-eks-node/i-XXXXX is not authorized to perform:
bedrock:InvokeModel on resource: arn:aws:bedrock:eu-west-1:ACCOUNT:inference-profile/eu.anthropic.claude-3-5-sonnet-20240620-v1:0
because no identity-based policy allows the bedrock:InvokeModel action
(Service: BedrockRuntime, Status Code: 403)

The assumed-role/prod-eks-node in the error shows the plugin is using the EC2 instance metadata (node role) instead of the IRSA credentials.

Root Cause

The langchain4j-bedrock module pulls in software.amazon.awssdk:bedrockruntime but not software.amazon.awssdk:sts. The AWS SDK v2 DefaultCredentialsProvider requires the sts module on the classpath to use StsAssumeRoleWithWebIdentityCredentialsProvider. Without it, the IRSA credential provider is silently skipped and the chain falls through to EC2 instance metadata.

Fix

Add software.amazon.awssdk:sts as an explicit dependency, matching the version pulled transitively by langchain4j-bedrock (2.33.5).

Logs

Configuration test failed: API request failed: User: arn:aws:sts::ACCOUNT:assumed-role/prod-eks-node/i-XXXXX
is not authorized to perform: bedrock:InvokeModel on resource:
arn:aws:bedrock:eu-west-1:ACCOUNT:inference-profile/eu.anthropic.claude-3-5-sonnet-20240620-v1:0
because no identity-based policy allows the bedrock:InvokeModel action
(Service: BedrockRuntime, Status Code: 403, Request ID: XXXXX) (SDK Attempt Count: 1)