chore: bump version to v1.15.0-rc1

[simlecode]

关联的Issues (Related Issues)

close

改动 (Proposed Changes)

附注 (Additional Info)

自查清单 (Checklist)

在你认为本 PR 满足被审阅的标准之前，需要确保 / Before you mark the PR ready for review, please make sure that:

• 符合Venus项目管理规范中关于PR的相关标准 / The PR follows the PR standards set out in the Venus project management guidelines
• 具有清晰明确的commit message / All commits have a clear commit message.
• 包含相关的的测试用例或者不需要新增测试用例 / This PR has tests for new functionality or change in behaviour or not need to add new tests.
• 包含相关的的指南以及文档或者不需要新增文档 / This PR has updated usage guidelines and documentation or not need
• 通过必要的检查项 / All checks are green

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.57%. Comparing base (5cc0ae5) to head (00344cc).

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #240      +/-   ##
==========================================
+ Coverage   46.54%   46.57%   +0.03%     
==========================================
  Files          45       45              
  Lines        3096     3096              
==========================================
+ Hits         1441     1442       +1     
+ Misses       1480     1479       -1     
  Partials      175      175              

Flag	Coverage Δ
unittests	51.59% <ø> (+0.25%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
build/version.go	0.00% <ø> (ø)
lib/metrics/metrics.go	0.00% <ø> (ø)

... and 1 file with indirect coverage changes

[LinZexiao]

LGTM