fix build warnings for zenoh-plugin-storage-manager

[DenisBiryukov91]

fix build warnings for zenoh-plugin-storage-manager
resolves #1580

[github-actions]

PR missing one of the required labels: {'enhancement', 'documentation', 'dependencies', 'internal', 'breaking-change', 'bug', 'new feature'}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.19%. Comparing base (f8f4edd) to head (5f56a0c).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
zenoh/src/net/runtime/adminspace.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1919      +/-   ##
==========================================
- Coverage   71.36%   71.19%   -0.17%     
==========================================
  Files         364      364              
  Lines       65793    65793              
==========================================
- Hits        46951    46843     -108     
- Misses      18842    18950     +108     

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