build(deps): bump deps/libtommath from `3746c58` to `8314bde`

[dependabot[bot]]

Bumps deps/libtommath from 3746c58 to 8314bde.

Commits

• 8314bde Update version
• 8ce69f7 Merge tag 'v1.2.1' into develop
• 65c1256 Merge pull request #555 from libtom/port-546-to-develop
• 6175cca Prevent potential runtime-error in tests
• be78ab9 Fix possible integer overflow
• 97e5003 Merge branch 'release/1.2.1'
• 5f5761b Update Changelog
• f6b65b9 Update version
• 7e427ba update version
• 3c77ac2 fix date in changelog...again :-\
• Additional commits viewable in compare view

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