Prepare Vulkan v3.1.3 release

[antono3]

Summary

Prepare the Vulkan v3.1.3 patch release after the C int / V3 FD ABI correction in #58. Update the module version and pin CI's generator checkout to the merged C int → i32 fix from antono2/v_vulkan_bindings#16.

The Vulkan registry and bundled headers remain at v1.4.363.

Verification

• The binding PR Use fixed-width C int for Vulkan FD exports #58 passed Linux stable/master/V3, macOS stable, and Windows stable CI.
• A particle smoke test with matching i32 FD callers completed Vulkan–OpenCL memory sharing and semaphore handoff under V 0.5.2 and a locally patched V3 compiler.
• git diff --check passes.

After this PR's checks pass, tag v3.1.3 to trigger the guarded release workflow. The OpenCL example dependency can then pin that tag.