fix:occur a 400 error request when openapi key's parameter contain "a[0]"

[CalebZYC]

What's the purpose of this PR

fix:occur a 400 error request when openapi key's parameter contain "a[0]"

Which issue(s) this PR fixes:

Fixes #4422

Brief changelog

XXXXX

Follow this checklist to help us incorporate your contribution quickly and easily:

• Read the Contributing Guide before making this pull request.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit tests to verify the code.
• Run mvn clean test to make sure this pull request doesn't break anything.
• Update the CHANGES log.

[codecov-commenter]

Codecov Report

Merging #4424 (e1066b7) into master (b73204a) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #4424      +/-   ##
============================================
+ Coverage     53.34%   53.38%   +0.04%     
- Complexity     2683     2684       +1     
============================================
  Files           490      490              
  Lines         15245    15254       +9     
  Branches       1586     1586              
============================================
+ Hits           8132     8143      +11     
+ Misses         6555     6553       -2     
  Partials        558      558              

Impacted Files	Coverage Δ
.../framework/apollo/openapi/PortalOpenApiConfig.java	100.00% <100.00%> (ø)
...mework/apollo/portal/component/PortalSettings.java	65.62% <0.00%> (-4.69%)	⬇️
...ervice/service/ReleaseMessageServiceWithCache.java	87.05% <0.00%> (+1.17%)	⬆️
...ework/apollo/internals/RemoteConfigRepository.java	87.73% <0.00%> (+2.45%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b73204a...e1066b7. Read the comment docs.

[nobodyiam]

LGTM