fix: #1214 - go race detect

[beiwei30]

What this PR does:

fix #1214

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

Codecov Report

Merging #1220 (8ff4dd4) into 1.5 (a10ff4d) will decrease coverage by 7.54%.
The diff coverage is 60.35%.

❗ Current head 8ff4dd4 differs from pull request most recent head 39cae59. Consider uploading reports for the commit 39cae59 to get more accurate results

@@            Coverage Diff             @@
##              1.5    #1220      +/-   ##
==========================================
- Coverage   66.13%   58.59%   -7.55%     
==========================================
  Files         174      272      +98     
  Lines        9343    13235    +3892     
==========================================
+ Hits         6179     7755    +1576     
- Misses       2541     4523    +1982     
- Partials      623      957     +334     

Impacted Files	Coverage Δ
cluster/cluster_impl/available_cluster_invoker.go	66.66% <ø> (-6.67%)	⬇️
cluster/cluster_impl/broadcast_cluster_invoker.go	76.47% <ø> (-3.53%)	⬇️
cluster/cluster_impl/failfast_cluster_invoker.go	66.66% <ø> (-4.77%)	⬇️
cluster/cluster_impl/mock_cluster.go	0.00% <0.00%> (ø)
cluster/loadbalance/random.go	100.00% <ø> (ø)
cluster/router/healthcheck/factory.go	66.66% <0.00%> (ø)
common/extension/auth.go	0.00% <ø> (ø)
common/extension/cluster.go	0.00% <ø> (ø)
common/extension/cluster_interceptor.go	0.00% <0.00%> (ø)
common/extension/config_center.go	0.00% <ø> (ø)
... and 386 more

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[cvictory]

LGTM