[ISSUE #4576] Upgrade dledger version to 0.2.7

[RongtongJin]

Make sure set the target branch to develop

What is the purpose of the change

Upgrade dledger version to 0.2.7

Brief changelog

Upgrade dledger version to 0.2.7

Verifying this change

XXXX

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[codecov-commenter]

Codecov Report

Merging #4577 (8f580e9) into develop (35ce9ad) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #4577      +/-   ##
=============================================
- Coverage      48.19%   48.07%   -0.13%     
+ Complexity      5130     5112      -18     
=============================================
  Files            649      649              
  Lines          43037    43037              
  Branches        5629     5629              
=============================================
- Hits           20741    20689      -52     
- Misses         19787    19833      +46     
- Partials        2509     2515       +6     

Impacted Files	Coverage Δ
...rg/apache/rocketmq/common/stats/StatsSnapshot.java	84.61% <0.00%> (-15.39%)	⬇️
.../apache/rocketmq/common/stats/MomentStatsItem.java	38.09% <0.00%> (-9.53%)	⬇️
...ache/rocketmq/common/stats/MomentStatsItemSet.java	43.47% <0.00%> (-8.70%)	⬇️
...va/org/apache/rocketmq/store/PutMessageResult.java	66.66% <0.00%> (-8.34%)	⬇️
...org/apache/rocketmq/store/ha/WaitNotifyObject.java	66.07% <0.00%> (-5.36%)	⬇️
...va/org/apache/rocketmq/common/stats/StatsItem.java	50.83% <0.00%> (-5.00%)	⬇️
...ketmq/common/protocol/body/ConsumerConnection.java	95.83% <0.00%> (-4.17%)	⬇️
...org/apache/rocketmq/common/stats/StatsItemSet.java	44.77% <0.00%> (-2.99%)	⬇️
...lient/impl/consumer/DefaultMQPushConsumerImpl.java	40.84% <0.00%> (-2.47%)	⬇️
...n/java/org/apache/rocketmq/store/RunningFlags.java	31.11% <0.00%> (-2.23%)	⬇️
... and 10 more

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[coveralls]

Coverage decreased (-0.1%) to 51.909% when pulling 8f580e9 on RongtongJin:upgrade_dledger_version_2 into 35ce9ad on apache:develop.