MSVC 19.40 miscompilation/crash

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GH actions builds started failing recently. I've been seeing occasional crashes in CI, which retries fixed. Now they seem to be becoming more extensive

INFO: Auto-detected compiler version msvc 19.39

Works fine

INFO: Auto-detected compiler version msvc 19.40

Command '.\botan-test --data-dir=.\src\tests\data --run-memory-intensive-tests --test-results-dir=junit_results --report-properties=ci_target:static,os:windows' failed with error code 3221225477

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Possibly related: actions/runner-images#10004

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Combo Visual C++ and Github fuckup #4105

[reneme]

Yikes! I saw the occasional MSVC fails as well. Probably we should start trusting our CI setup more and investigate earlier... 😇

Hopefully this CI issue doesn't become a long-standing feature as the previous clang problem. 😨