chore: version: bump the version to v1.15.3-dev

[jennijuju]

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Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green

[codecov]

Codecov Report

Merging #8473 (787bcef) into master (cf92776) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8473      +/-   ##
==========================================
- Coverage   40.76%   40.76%   -0.01%     
==========================================
  Files         686      686              
  Lines       75495    75495              
==========================================
- Hits        30775    30772       -3     
+ Misses      39412    39396      -16     
- Partials     5308     5327      +19     

Impacted Files	Coverage Δ
build/version.go	27.27% <ø> (ø)
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
markets/loggers/loggers.go	89.28% <0.00%> (-10.72%)	⬇️
storage/wdpost_sched.go	75.49% <0.00%> (-5.89%)	⬇️
chain/types/tipset_key.go	85.96% <0.00%> (-3.51%)	⬇️
chain/stmgr/call.go	69.18% <0.00%> (-3.25%)	⬇️
chain/events/events_height.go	68.90% <0.00%> (-2.53%)	⬇️
chain/sub/incoming.go	58.10% <0.00%> (-2.45%)	⬇️
chain/events/events_called.go	83.90% <0.00%> (-1.96%)	⬇️
blockstore/autobatch.go	56.30% <0.00%> (-1.69%)	⬇️
... and 15 more