Bump ffi from 1.17.2 to 1.17.4 in /gem

[dependabot]

Bumps ffi from 1.17.2 to 1.17.4.

Changelog

Sourced from ffi's changelog.

1.17.4 / 2026-03-26

Fixed:

• Fix union by-value ABI mismatch with float and double types on ARM64 and X86_64. See #1177 and #1178 for details.
• Exclude libffi files, which are unnecessary. #1176

1.17.3 / 2025-12-29

Fixed:

• Opt-in for MFA requirement explicitly. #1159
• Fix type signature for FFI::AutoPointer#initialize, FFI::StructByReference#native_type and FFI::Struct#auto_ptr . #1158
• Fix function signature of function_call in FFI trampoline. #1154 It failed on aarch64-mingw-ucrt.
• Add workaround for segmentation faults on aarch64-mingw-ucrt. #1154
• Call super in Library#freeze . #1154
• Deny duplication of AutoPointer per #dup and #clone . #1173 They led to double free before.

Added:

• Add binary gems for Ruby-4.0, now providing binary gems for Ruby-3.0 to 4.0.
• Add msys2_mingw_dependencies for Windows Mingw for automatic installation of libffi. #1143
• Mark callback dispatcher thread as fork safe for Puma. #1156
• Add missing FFI::Platform module and LastError signatures. #1169

Removed:

• Drop fat binary gems for Ruby < 3.0
• Remove FFI::TypesGenerator from distributed gems. #1164
• Remove libffi build dir after install, safing some install space. #1157

Commits

• 949809c Bump VERSION to 1.17.4
• 9271775 Merge pull request #1178 from cfis/fix-union-arm64-abi
• 3743839 Skip failing specs on JRuby
• 7078a4e Fix MSVC build.
• 93a85ca Move union-by-value argument tests to the section excluded by Truffleruby
• b0c95a9 Correctly handle unions with mixed floating point types.
• 5348a51 Simplify the union type selection
• dd15f68 Extend the union tests
• 372045e Fix union by-value ABI mismatch on ARM64. See #1177 for details.
• 60dbd77 Merge pull request #1180 from ffi/add-more-arm64
• Additional commits viewable in compare view

Note
Automatic rebases have been disabled on this pull request as it has been open for over 30 days.