Fix: serviceAccountToken volume error in sidecarset

[y-ykcir]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

fixes #1231

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #1238 (e28ef20) into master (1d1a54a) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head e28ef20 differs from pull request most recent head d56dd82. Consider uploading reports for the commit d56dd82 to get more accurate results

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@@            Coverage Diff             @@
##           master    #1238      +/-   ##
==========================================
- Coverage   50.32%   50.31%   -0.02%     
==========================================
  Files         143      143              
  Lines       19846    19847       +1     
==========================================
- Hits         9988     9986       -2     
- Misses       8767     8769       +2     
- Partials     1091     1092       +1     

Flag	Coverage Δ
unittests	50.31% <100.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...set/validating/sidecarset_create_update_handler.go	59.05% <100.00%> (+0.12%)	⬆️

... and 2 files with indirect coverage changes

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[veophi]

/lgtm

[furykerry]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: furykerry

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