Bump deps/libtommath from `8314bde` to `b996311`

[dependabot[bot]]

Bumps deps/libtommath from 8314bde to b996311.

Commits

• b996311 Merge pull request #587 from libtom/update-ci
• b59524c Clang-11 sanitizer seems to be broken.
• bbf4dff x32 ABI is no longer supported on Ubuntu 22.04.
• 8ce7850 Work around false-positive warning.
• 68c1463 Fix wrongly ordered cleanup.
• 4e22dcb Ubuntu 20.04 is no longer supported for CI
• b2cdf65 Cancel running CI job if PR is updated.
• afc1411 Make it possible to deploy for Ubuntu 24.04
• 5938524 Bump actions/upload-artifacts version
• 886b2bf Merge pull request #586 from libtom/fix-582
• Additional commits viewable in compare view

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