upgrade netty for dubbo-all

[diecui1202]

What is the purpose of the change

Because dubbo use netty4 as the default transport, so upgrade netty dependency for dubbo-all

Brief changelog

dubbo-all/pom.xml

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #2123 into master will decrease coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2123      +/-   ##
============================================
- Coverage     54.19%   54.11%   -0.08%     
+ Complexity     5085     5081       -4     
============================================
  Files           559      559              
  Lines         24922    24922              
  Branches       4442     4442              
============================================
- Hits          13506    13487      -19     
- Misses         9380     9395      +15     
- Partials       2036     2040       +4

Impacted Files	Coverage Δ	Complexity Δ
...he/dubbo/remoting/transport/netty/NettyClient.java	72.88% <0%> (-8.48%)	12% <0%> (-1%)
...ubbo/rpc/protocol/dubbo/ChannelWrappedInvoker.java	41.66% <0%> (-8.34%)	3% <0%> (ø)
...rpc/protocol/dubbo/telnet/InvokeTelnetHandler.java	51.89% <0%> (-3.8%)	11% <0%> (-2%)
...he/dubbo/remoting/transport/netty/NettyServer.java	67.85% <0%> (-3.58%)	8% <0%> (-1%)
...bo/remoting/transport/netty/NettyCodecAdapter.java	53.12% <0%> (-1.57%)	3% <0%> (ø)
...dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java	77.2% <0%> (-1.48%)	29% <0%> (ø)
...apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java	58.33% <0%> (-0.84%)	30% <0%> (-1%)

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