upgrade netty to 4.1.47.Final

[m1ngyuan]

Netty 4.1.47.Final released

[codecov]

Codecov Report

Merging #1239 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1239      +/-   ##
============================================
- Coverage     78.78%   78.74%   -0.05%     
+ Complexity     5827     5822       -5     
============================================
  Files           424      424              
  Lines         19645    19645              
  Branches       2222     2222              
============================================
- Hits          15478    15470       -8     
- Misses         3127     3132       +5     
- Partials       1040     1043       +3

Impacted Files	Coverage Δ	Complexity Δ
.../io/lettuce/core/protocol/ReconnectionHandler.java	71.62% <0%> (-8.11%)	19% <0%> (-3%)
...a/io/lettuce/core/protocol/ConnectionWatchdog.java	75.81% <0%> (-1.97%)	35% <0%> (-2%)
.../io/lettuce/core/dynamic/ReactiveTypeAdapters.java	86.52% <0%> (-0.87%)	1% <0%> (ø)
src/main/java/io/lettuce/core/ScanStream.java	87.01% <0%> (-0.65%)	24% <0%> (ø)
...va/io/lettuce/core/protocol/RedisStateMachine.java	79.86% <0%> (+0.68%)	90% <0%> (+1%)	⬆️
...ttuce/core/support/ClientResourcesFactoryBean.java	60% <0%> (+13.33%)	5% <0%> (+1%)	⬆️

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