ci: add stage to auto-update peerDependencies

[veronika-alraheem]

Checklist

• Added tests for code changes or test/build only changes
• Updated the change log file (CHANGES.md) or test/build only changes
• Completed the PR template below:

Description

Added Update peerDependencies stage to Jenkinsfile to auto-update cloudant-node-sdk peer dependencies.
Fixes i596

Approach

• Added a Jenkins stage that only runs for cloudant-node-sdk Dependabot update branches.
• The stage is gated by when conditions to ensure it only executes on the initial build and only for the expected dependency update.
• The SDK version is read from the Dependabot update and used to determine the corresponding ibm-cloud-sdk-core and axios versions.
• The peer dependencies are then updated to the versions required by the updated SDK.

Schema & API Changes

• "No change"

Security and Privacy

• "No change"

Testing

• N/A build or packaging only changes

Monitoring and Logging

• "No change"