fixed: Thread safety in AssemblyStoreReader

[jamescrosswell]

Fixes #4799:

• Running several SentrySdk.CaptureMessage in parallel freezes the MAUI Android app #4799

Note

I haven't added a changelog... thinking if we get this done and merge it first, that won't be necessary:

• chore: Enable automatic release management #4818

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

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Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

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## Unreleased

### Features

- Thread safety in AssemblyStoreReader ([#4814](https://github.com/getsentry/sentry-dotnet/pull/4814))

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Generated by 🚫 dangerJS against cc772dc

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.81%. Comparing base (26d1bba) to head (c6ec0d3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4814      +/-   ##
==========================================
+ Coverage   73.80%   76.81%   +3.01%     
==========================================
  Files         483      394      -89     
  Lines       17547    14767    -2780     
  Branches     3460     2968     -492     
==========================================
- Hits        12950    11343    -1607     
+ Misses       3746     2714    -1032     
+ Partials      851      710     -141     

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