bump to v1.6.0-alpha.5

[csuzhangxc]

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.

[ti-chi-bot]

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[csuzhangxc]

/test pull-e2e-kind-basic

[ti-chi-bot]

@csuzhangxc: The label(s) /pull-e2e-kind-basic cannot be applied, because the repository doesn't have them.

In response to this:

/test pull-e2e-kind-basic

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[ti-chi-bot]

@csuzhangxc: No presubmit jobs available for pingcap/tidb-operator@master

In response to this:

/test pull-e2e-kind-basic

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[codecov-commenter]

Codecov Report

Merging #5226 (1fcf682) into master (6cff3fa) will decrease coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5226      +/-   ##
==========================================
- Coverage   57.76%   57.75%   -0.02%     
==========================================
  Files         246      246              
  Lines       29479    29479              
==========================================
- Hits        17030    17025       -5     
- Misses      10794    10798       +4     
- Partials     1655     1656       +1     

Flag	Coverage Δ
unittest	57.75% <ø> (-0.02%)	⬇️