fix sidecarset upgrade exception for UpdateExpectations

[zmberg]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[veophi]

/LGTM

[codecov-commenter]

Codecov Report

Merging #1435 (9be4afe) into master (459efe6) will increase coverage by 0.03%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #1435      +/-   ##
==========================================
+ Coverage   48.21%   48.24%   +0.03%     
==========================================
  Files         153      153              
  Lines       21501    21500       -1     
==========================================
+ Hits        10366    10373       +7     
+ Misses       9993     9986       -7     
+ Partials     1142     1141       -1     

Flag	Coverage Δ
unittests	48.24% <ø> (+0.03%)	⬆️

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Files	Coverage Δ
...troller/sidecarset/sidecarset_pod_event_handler.go	63.33% <ø> (-0.31%)	⬇️

... and 1 file with indirect coverage changes

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[zmberg]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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