[ISSUE #8549] Ipv6 enabled in broker, pickupStoreTimestamp size should be 20

[leizhiyuan]

Which Issue(s) This PR Fixes

Fixes #8549

Brief Description

ipv6 enabled in broker, pickupStoreTimestamp size should be 20

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 47.08%. Comparing base (8b7f9cc) to head (978de98).
Report is 71 commits behind head on develop.

Files with missing lines	Patch %	Lines
...org/apache/rocketmq/store/DefaultMessageStore.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8567      +/-   ##
=============================================
- Coverage      47.15%   47.08%   -0.08%     
+ Complexity     11390    11375      -15     
=============================================
  Files           1275     1275              
  Lines          89108    89111       +3     
  Branches       11467    11468       +1     
=============================================
- Hits           42017    41955      -62     
- Misses         41906    41968      +62     
- Partials        5185     5188       +3     

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[jaylu163]

5.2版本还有问题。有修改这个版本吗