Update shared and sentry_sdk

[Swatinem]

This pulls in an updated version of shared that has more caching, in particular around GitHub calls.

Also updates the sentry_sdk, and configures it to automatically flag redis calls related to caching.

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Updating the Sentry SDK for some reasons I don’t understand required me to mess with the django signals and shelter integration. On the positive side, we had shelter enabled for tests, which resulted in a shitton of errors being logged to the console, as it was constantly firing requests into nowhere in the background.
This change should thus reduce log spam when running tests, as well as speeding those up a bit.

I can also extract that change as its own PR if necessary.

[sentry-autofix]

✅ Sentry found no issues in your recent changes ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.36%. Comparing base (382f278) to head (005f2f8).
Report is 4 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1272      +/-   ##
==========================================
+ Coverage   96.32%   96.36%   +0.03%     
==========================================
  Files         487      487              
  Lines       16907    16897      -10     
==========================================
- Hits        16285    16282       -3     
+ Misses        622      615       -7     

Flag	Coverage Δ
unit	96.36% <100.00%> (+0.03%)	⬆️

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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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