chore: build: bump the master version to v1.15.2-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
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[codecov]

Codecov Report

Merging #8322 (56b80c4) into master (c98ef0a) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8322      +/-   ##
==========================================
- Coverage   40.37%   40.27%   -0.10%     
==========================================
  Files         679      679              
  Lines       73992    73992              
==========================================
- Hits        29874    29801      -73     
- Misses      38911    38961      +50     
- Partials     5207     5230      +23     

Impacted Files	Coverage Δ
build/version.go	27.27% <ø> (ø)
lib/addrutil/parse.go	75.00% <0.00%> (-15.91%)	⬇️
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
miner/miner.go	55.73% <0.00%> (-4.27%)	⬇️
node/modules/core.go	46.46% <0.00%> (-3.04%)	⬇️
chain/stmgr/searchwait.go	67.30% <0.00%> (-2.57%)	⬇️
chain/sub/incoming.go	45.25% <0.00%> (-2.45%)	⬇️
chain/events/events_called.go	83.90% <0.00%> (-2.44%)	⬇️
storage/wdpost_sched.go	75.49% <0.00%> (-1.97%)	⬇️
extern/storage-sealing/currentdealinfo.go	71.17% <0.00%> (-1.81%)	⬇️
... and 16 more