Bump operator version to 1.4.5

[hanlins]

What problem does this PR solve?

What is changed and how does it work?

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[codecov-commenter]

Codecov Report

Merging #5070 (c77bca2) into release-1.4 (6bc596a) will increase coverage by 8.87%.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.4    #5070      +/-   ##
===============================================
+ Coverage        58.86%   67.73%   +8.87%     
===============================================
  Files              227      231       +4     
  Lines            26268    29422    +3154     
===============================================
+ Hits             15462    19930    +4468     
+ Misses            9323     7970    -1353     
- Partials          1483     1522      +39     

Flag	Coverage Δ
e2e	52.84% <ø> (?)
unittest	58.83% <ø> (-0.03%)	⬇️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-15 14:01:03.256281055 +0000 UTC m=+267059.670885131: ☑️ agreed by csuzhangxc.

[hanlins]

/merge

[hanlins]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csuzhangxc, hanlins

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[hanlins]

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