try setting gcc12

[snadrus]

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[Copilot]

Pull Request Overview

This PR downgrades the fvm4 dependency from version 4.7.4 to 4.7.3, removes the "nv28-dev" feature flag, and configures GCC 12 across CI jobs to address compilation compatibility issues.

• Downgrades fvm4 and fvm4_shared from version 4.7.4 to 4.7.3
• Removes the "nv28-dev" feature from fvm4 dependency
• Adds GCC 12 installation and environment configuration to all three CI jobs (check, cgo-bindings, supraseal)

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
rust/Cargo.toml	Downgrades fvm4 packages to version 4.7.3 and removes nv28-dev feature flag
.github/workflows/ci.yml	Installs GCC 12 and configures compiler environment variables across CI jobs

Comments suppressed due to low confidence (1)

.github/workflows/ci.yml:161

• The NVCC_PREPEND_FLAGS in the supraseal job is missing the -allow-unsupported-compiler flag that is present in the check job (line 53) and cgo-bindings job (line 118). This inconsistency could lead to different compilation behavior. Consider adding -allow-unsupported-compiler to maintain consistency: NVCC_PREPEND_FLAGS: \"-ccbin /usr/bin/g++-12 -allow-unsupported-compiler\"

      NVCC_PREPEND_FLAGS: "-ccbin /usr/bin/g++-12"

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