fix: add @aws-sdk/xml-builder override to resolve entity expansion limit

[Hweinstock]

Description

The container-strands-bedrock e2e test fails with Entity expansion limit exceeded: 1015 > 1000 during CDK deploy. This is caused by fast-xml-parser 5.5.7 introducing a default maxTotalExpansions: 1000 limit (as part of CVE-2026-33036 / CVE-2026-33349 fixes), while @aws-sdk/xml-builder@3.972.10 does not configure this parameter. Standard XML entity escaping (", &, etc.) in CloudFormation API responses counts toward this limit, and the container deploy template exceeds it.

The AWS SDK team fixed this in @aws-sdk/xml-builder@3.972.14 (aws/aws-sdk-js-v3#7867) by setting maxTotalExpansions: Infinity for trusted API responses. This PR adds an npm override to pull in the fixed version.

Related Issue

Closes #600

Documentation PR

N/A

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

Testing

Manually triggered workflow on this branch, temporarily adding this test to non-full version, https://github.com/aws/agentcore-cli/actions/runs/23438632117/job/68183188908.

In the future we should make this easier.

• I ran npm run test:unit and npm run test:integ
• I ran npm run typecheck
• I ran npm run lint
• If I modified src/assets/, I ran npm run test:update-snapshots and committed the updated snapshots

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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[notgitika]

LGTM