fix sample url using https://github.com/apache/dubbo-go-pixiu-samples…

[ma642]

….git

What this PR does: fix sample url using https://github.com/apache/dubbo-go-pixiu-samples…

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?: NONE

[codecov-commenter]

Codecov Report

Merging #506 (d9a7a0f) into develop (b71ac6e) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #506      +/-   ##
===========================================
+ Coverage    54.73%   54.74%   +0.01%     
===========================================
  Files          666      664       -2     
  Lines        77905    77746     -159     
===========================================
- Hits         42638    42559      -79     
+ Misses       31635    31555      -80     
  Partials      3632     3632              

Impacted Files	Coverage Δ
security/pkg/credentialfetcher/fetcher.go	40.00% <0.00%> (-20.00%)	⬇️
pkg/istio-agent/xds_proxy_delta.go	45.59% <0.00%> (-6.74%)	⬇️
pkg/test/framework/resource/version.go	18.42% <0.00%> (-1.76%)	⬇️
pilot/pkg/bootstrap/certcontroller.go	42.51% <0.00%> (-1.20%)	⬇️
pilot/pkg/model/service.go	46.60% <0.00%> (-0.91%)	⬇️
pilot/pkg/model/jwks_resolver.go	78.29% <0.00%> (-0.78%)	⬇️
security/pkg/nodeagent/cache/secretcache.go	84.94% <0.00%> (-0.77%)	⬇️
pixiu/pkg/server/pixiu_start.go	3.22% <0.00%> (-0.73%)	⬇️
pilot/pkg/bootstrap/server.go	53.11% <0.00%> (-0.46%)	⬇️
pkg/istio-agent/xds_proxy.go	61.17% <0.00%> (-0.44%)	⬇️
... and 9 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[mark4z]

LGTM