refactor!: update module to v4 and replace vault with openbao

[jinlinGuan]

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• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.2% Duplication on New Code

See analysis details on SonarCloud

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 21.87500% with 25 lines in your changes missing coverage. Please review.

Project coverage is 28.98%. Comparing base (c89e7d4) to head (2fd20ad).

Files with missing lines	Patch %	Lines
internal/security/secretstore/init.go	22.22%	14 Missing ⚠️
internal/security/secretstore/main.go	0.00%	4 Missing ⚠️
.../security/config/command/proxy/shared/proxyuser.go	0.00%	3 Missing ⚠️
internal/security/secretstore/vmkencryption.go	50.00%	2 Missing ⚠️
internal/security/fileprovider/init.go	0.00%	1 Missing ⚠️
internal/security/proxyauth/init.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4982      +/-   ##
==========================================
- Coverage   29.35%   28.98%   -0.38%     
==========================================
  Files         249      249              
  Lines       18676    18536     -140     
==========================================
- Hits         5483     5372     -111     
+ Misses      11948    11945       -3     
+ Partials     1245     1219      -26     

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[cloudxxx8]

LGTM