Bump up the csi-spec version from 1.5 to 1.6 in csi-powerflex

[KshitijaKakde]

Description

A few sentences describing the overall goals of the pull request's commits.

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#905

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, vetting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Backward compatibility is not broken

[adarsh-dell]

Hello @KshitijaKakde, it's advisable to consolidate all these modifications within a feature branch rather than merging them directly into the main branch until the entire feature is fully implemented.

While I understand that these changes won't affect the core functionality, they do introduce new struct definitions, so it's best to confine them to the feature branch for now.

Thanks,
Adarsh

[KshitijaKakde]

Hello @KshitijaKakde, it's advisable to consolidate all these modifications within a feature branch rather than merging them directly into the main branch until the entire feature is fully implemented.

While I understand that these changes won't affect the core functionality, they do introduce new struct definitions, so it's best to confine them to the feature branch for now.

Thanks, Adarsh

Done @adarsh-dell