Bump serverless from 3.40.0 to 4.28.0 in /backend

[dependabot]

Bumps serverless from 3.40.0 to 4.28.0.

Release notes

Sourced from serverless's releases.

4.28.0

Features

• Serverless Framework
  • Added support for AWS Lambda Managed Instances. Learn more in the docs.
  • Added support for AWS Lambda durable functions. Learn more in the docs. (serverless/serverless#13180)

Maintenance

• Upgrade aws-sdk-js-v3 to 3.943.0

4.27.1

Bux Fixes

• Serverless Framework
  • Added an option to pass the tenant ID in sls invoke
  • Fixed a regression affecting integration request parameters in AWS REST API

4.27.0

Features

• Serverless Framework
  • Added support for ap-southeast-6 AWS region (serverless/serverless#13174)
  • Added support for IPv6 outbound connections for Lambda functions running in dual-stack subnets (ipv6AllowedForDualStack). Learn more in the docs (serverless/serverless#12253)

Bux Fixes

• Serverless Framework
  • Fixed AWS error handling in Axiom integration (serverless/serverless#13173)
  • Enabled support for nodejs24.x runtime in dev mode (serverless/serverless#13172)

4.26.1

Bug Fixes

• Serverless Framework
  • Fixed AWS SDK error handling

4.26.0

Features

• Serverless Framework
  • Added support for Lambda tenant isolation mode so multi-tenant services can run each tenant in its own isolated execution environment (see AWS announcement and read more in our docs).

    functions:
      multiTenantFunction:
        handler: handler.handler
        tenancy:
          mode: per_tenant

  • Added configuration options for API Gateway security policy and endpoint access mode in serverless.yml (see AWS announcement and read more in our docs).

    provider:
      name: aws

... (truncated)

Commits

• b83fbd3 Revise README for V.4 updates and new features (#13179)
• 3110342 add recent features to readme
• e2681bd chore: update readme to include serverless MCP and container framework
• 1003a32 docs: update SECURITY.md (#13026)
• ec4957f chore: automate CLA signing (#13019)
• c4cebae chore: automate CLA signing
• 87b4f5b docs: read license key from aws ssm (#12986)
• 3f37cba docs(dev-mode): added note regarding vpc (#12977)
• d262ac3 feat: add support for ap-southeast-5 and ca-west-1 (#12981)
• 2aea99d fix: correctly resolve layer package artifact and docker image paths (#12972)
• Additional commits viewable in compare view

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Superseded by #1420.