Upgrade checkedc-llvm-test-suite

[secure-sw-dev-bot]

This issue was copied from checkedc/checkedc-clang#992

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The checkedc-llvm-test-suite is now outdated and causes issues like microsoft/checkedc-llvm-test-suite#105.

We need to update it to a newer version.

This should be addressed together with checkedc/checkedc-clang#994