Replace the Swagger JS CDN source from jsdelivr to unpkg.com

[chenghonour]

The jsdelivr cdn certificate expired in the mainland, causing the website to hang. To fix it, the solution is to replace the CDN source to unpkg.com

[codecov-commenter]

Codecov Report

Merging #1852 (b97cf95) into master (b7295a1) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1852      +/-   ##
==========================================
+ Coverage   73.47%   73.50%   +0.03%     
==========================================
  Files         495      495              
  Lines       44336    44336              
==========================================
+ Hits        32574    32591      +17     
+ Misses       9800     9788      -12     
+ Partials     1962     1957       -5     

Flag	Coverage Δ
go-1.15	73.45% <ø> (-0.02%)	⬇️
go-1.16	73.46% <ø> (?)
go-1.17	73.48% <ø> (?)

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Impacted Files	Coverage Δ
net/ghttp/ghttp_server_swagger.go	75.00% <ø> (ø)
container/gtree/gtree_avltree.go	95.97% <0.00%> (+0.57%)	⬆️
net/ghttp/ghttp_server.go	62.61% <0.00%> (+0.66%)	⬆️
os/gcmd/gcmd_parser.go	92.90% <0.00%> (+0.70%)	⬆️
container/gmap/gmap_hash_str_any_map.go	95.15% <0.00%> (+1.03%)	⬆️
os/glog/glog_logger_rotate.go	67.31% <0.00%> (+1.46%)	⬆️
net/gtcp/gtcp_pool.go	38.63% <0.00%> (+4.54%)	⬆️

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