Release prep

[benjeffery]

Prep for Python 0.5.1 and C 1.1.0.

[codecov]

Codecov Report

Merging #2403 (42190e1) into main (812af67) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2403   +/-   ##
=======================================
  Coverage   93.34%   93.34%           
=======================================
  Files          28       28           
  Lines       26982    26982           
  Branches     1245     1245           
=======================================
  Hits        25187    25187           
  Misses       1761     1761           
  Partials       34       34           

Flag	Coverage Δ
c-tests	92.26% <ø> (ø)
lwt-tests	89.05% <ø> (ø)
python-c-tests	71.01% <100.00%> (ø)
python-tests	98.96% <100.00%> (ø)

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

Impacted Files	Coverage Δ
c/tskit/core.h	100.00% <ø> (ø)
python/tskit/_version.py	100.00% <100.00%> (ø)

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