Bump verif/core-v-verif from `34d39b9` to `f81a9fa`

Created by: dependabot[bot]

Bumps verif/core-v-verif from 34d39b9 to f81a9fa.

Commits

• f81a9fa Merge pull request #2418 from ThalesSiliconSecurity/dev/spikeYAML
• 78fbb3e [Spike] Fix help string.
• 764c545 [Spike DPI] Always set default params (assume RV32 arch by default.)
• 2944e36 [Spike YAML] Improve yaml-cpp build.
• 37c274b Implementation of Spike param via Yaml files
• See full diff in compare view

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