Add compat entries for stdlibs

[nickrobinson251]

The registry PR failed with:

The following dependencies do not have a [compat] entry that is upper-bounded and only includes a finite number of breaking releases: Serialization, Sockets

Due to this recent change in requirements: https://discourse.julialang.org/t/psa-compat-requirements-in-the-general-registry-are-changing/104958

the advice there is:

For now you should simply match the version of your Julia compat entry, for all your standard library compat entries.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c5cb574) 89.63% compared to head (966524a) 89.86%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
+ Coverage   89.63%   89.86%   +0.22%     
==========================================
  Files           8        8              
  Lines         357      365       +8     
==========================================
+ Hits          320      328       +8     
  Misses         37       37              

Files	Coverage Δ
src/pools.jl	95.08% <100.00%> (+0.74%)	⬆️

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