Switch cache to msgpack

[Swatinem]

We would like to cache bytes, which is being rejected by JSON.
msgpack does not have that problem, and should be slightly faster/smaller than JSON in either case.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.60%. Comparing base (ae1d4cf) to head (a11b128).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #601   +/-   ##
=======================================
  Coverage   88.59%   88.60%           
=======================================
  Files         463      463           
  Lines       12786    12776   -10     
  Branches     1458     1454    -4     
=======================================
- Hits        11328    11320    -8     
+ Misses       1153     1151    -2     
  Partials      305      305           

Flag	Coverage Δ
shared-docker-uploader	88.60% <100.00%> (+<0.01%)	⬆️

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[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codspeed-hq]

CodSpeed Performance Report

Merging #601 will not alter performance

_{Comparing swatinem/msgpack-cache (a11b128) with main (ae1d4cf)}

Summary

✅ 9 untouched benchmarks