T6619: remove unused imports

[c-po]

Change Summary

# make unused-imports
************* Module protocols_static_multicast
src/conf_mode/protocols_static_multicast.py:17:0: W0611: Unused import os (unused-import)
src/conf_mode/protocols_static_multicast.py:25:0: W0611: Unused call imported from vyos.utils.process (unused-import)
src/conf_mode/protocols_static_multicast.py:26:0: W0611: Unused render imported from vyos.template (unused-import)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T6619

Related PR(s)

• T5873: T6619: remove unused imports #3939

Component(s) name

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

👍
No issues in PR Title / Commit Title

[github-actions]

👍
No issues in unused-imports