CI: fix usage test

[SandyXSD]

No description provided.

[github-actions]

Mutate Test Report
pkg/usage/usage_test.go-1-1: score:0.23 failed:10, passed:3, compile error:1, out of coverage:3, skip by comment:0, others:0
Job detail: https://github.com/juicedata/juicefs/actions/runs/4219755799/jobs/7325434313

Usage: https://github.com/juicedata/juicefs/blob/main/.github/scripts/mutate/how_to_use_mutate_test.md

[codecov-commenter]

Codecov Report

Base: 55.57% // Head: 55.50% // Decreases project coverage by -0.08% ⚠️

Coverage data is based on head (0ae9e17) compared to base (a0245fa).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3252      +/-   ##
==========================================
- Coverage   55.57%   55.50%   -0.08%     
==========================================
  Files         142      142              
  Lines       33244    33244              
==========================================
- Hits        18477    18452      -25     
- Misses      12817    12839      +22     
- Partials     1950     1953       +3     

Impacted Files	Coverage Δ
pkg/fuse/context.go	65.85% <0.00%> (-7.32%)	⬇️
pkg/chunk/disk_cache.go	71.94% <0.00%> (-2.04%)	⬇️
pkg/meta/sql.go	58.77% <0.00%> (-0.29%)	⬇️
pkg/vfs/reader.go	79.27% <0.00%> (-0.16%)	⬇️
pkg/meta/redis.go	66.18% <0.00%> (+0.03%)	⬆️

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