[building] refine: fix dep and clean useless code

[PsiACE]

Signed-off-by: Chojan Shang psiace@outlook.com

Summary

• Use the master branch to ensure that at least it is available - https://github.com/drmingdrmer/async-raft
• Clean up warnings during testing - unused import

Changelog

• Build/Testing/CI

Related Issues

Fixes #688

Test Plan

No test plan.

[databend-bot]

Thanks for the contribution!
I have applied any labels matching special text in your PR Changelog.

Please review the labels and make any necessary changes.

[codecov-commenter]

Codecov Report

Merging #689 (79112a1) into master (14a78f5) will decrease coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #689   +/-   ##
======================================
- Coverage      78%     78%   -1%     
======================================
  Files         307     307           
  Lines       16569   16569           
======================================
- Hits        13023   13020    -3     
- Misses       3546    3549    +3     

Impacted Files	Coverage Δ
common/flights/src/dns_resolver_test.rs	85% <ø> (ø)
common/runtime/src/runtime_test.rs	46% <0%> (-20%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 14a78f5...79112a1. Read the comment docs.

[PsiACE]

@zhang2014 It seems that there are some problems with welcome ci.

Error: Resource not accessible by integration

It may be a config error.

[BohuTANG]

@zhang2014 It seems that there are some problems with welcome ci.

Error: Resource not accessible by integration

It may be a config error.

This action is flasky, I will remove it soon.
The welcome greeting will by the fusebots:
#601 (comment)