Bump version to 1.5.1.dev0

[bdraco]

Waits for https://github.com/aio-libs/frozenlist/actions/runs/11473328151

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (91991e3) to head (0306356).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #613   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          333       333           
  Branches        24        24           
=========================================
  Hits           333       333           

Flag	Coverage Δ
CI-GHA	99.39% <100.00%> (-0.31%)	⬇️
OS-Linux	99.39% <100.00%> (ø)
OS-Windows	99.22% <100.00%> (-0.18%)	⬇️
OS-macOS	98.83% <100.00%> (-0.39%)	⬇️
Py-3.10.11	98.06% <100.00%> (ø)
Py-3.10.15	98.19% <100.00%> (ø)
Py-3.11.10	98.19% <100.00%> (ø)
Py-3.11.9	98.06% <100.00%> (ø)
Py-3.12.7	98.19% <100.00%> (ø)
Py-3.13.0	98.19% <100.00%> (ø)
Py-3.8.10	98.83% <100.00%> (ø)
Py-3.8.18	98.79% <100.00%> (ø)
Py-3.9.13	98.06% <100.00%> (-1.34%)	⬇️
Py-3.9.20	98.19% <100.00%> (ø)
Py-pypy7.3.11	97.67% <100.00%> (ø)
Py-pypy7.3.16	96.89% <100.00%> (ø)
Py-pypy7.3.17	96.89% <100.00%> (ø)
VM-macos	98.83% <100.00%> (-0.39%)	⬇️
VM-ubuntu	99.39% <100.00%> (ø)
VM-windows	99.22% <100.00%> (-0.18%)	⬇️

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