[#noissue] Fix cxf-it test

[jaehong-kim]

Fix cxf-it test

com.navercorp.pinpoint.plugin.cxf.CxfClientIT.test[cxf-rt-rs-client-3.6.0:child:8]

Error Message
java.lang.UnsupportedClassVersionError: org/apache/cxf/jaxrs/client/WebClient has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

[codecov]

Codecov Report

Merging #10005 (c2a6aac) into master (a5dff7d) will decrease coverage by 0.34%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #10005      +/-   ##
============================================
- Coverage     38.98%   38.64%   -0.34%     
+ Complexity    11804    11597     -207     
============================================
  Files          3602     3570      -32     
  Lines         94017    93043     -974     
  Branches      10381    10261     -120     
============================================
- Hits          36650    35960     -690     
+ Misses        54212    54001     -211     
+ Partials       3155     3082      -73     

see 64 files with indirect coverage changes