chore: bump app store plugin version

[ruibaby]

What type of PR is this?

/area core
/kind improvement
/milestone 2.20.x

What this PR does / why we need it:

Bump app store plugin to 1.6.0

Does this PR introduce a user-facing change?

None

[f2c-ci-robot]

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.17%. Comparing base (eff73dc) to head (42c36fb).
Report is 13 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6881      +/-   ##
============================================
+ Coverage     56.99%   57.17%   +0.17%     
- Complexity     3999     4003       +4     
============================================
  Files           714      712       -2     
  Lines         24110    24124      +14     
  Branches       1585     1592       +7     
============================================
+ Hits          13742    13792      +50     
+ Misses         9756     9717      -39     
- Partials        612      615       +3     

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