build(deps): bump mini_racer from 0.21.1 to 0.21.4 in /docs/v3

[dependabot]

Bumps mini_racer from 0.21.1 to 0.21.4.

Changelog

Sourced from mini_racer's changelog.

• 0.21.4 - 24-06-2026

  • Fix stale V8 termination state after interrupts/timeouts so contexts remain usable after cancelled evaluations
  • Let Ruby interrupts wake MiniRacer calls without immediately terminating V8, allowing signal traps and nested callbacks to unwind safely
  • Add benchmark suite covering eval, serialization/deserialization, and transpilation workloads

• 0.21.3 - 18-06-2026

  • Fix :single_threaded contexts inherited across fork by recovering idle reusable native runners in the child process without falling back to per-dispatch native thread spawning
  • Avoid intermittent heap corruption during :single_threaded context finalization, especially when forked children exit normally after touching inherited contexts
  • Avoid finalizer hangs when a forked child garbage-collects a non-idle inherited :single_threaded context
  • Allow Ruby thread interrupts, process shutdown, and cross-thread Context#dispose to terminate busy :single_threaded JavaScript execution instead of hanging
  • Make Context#dispose while an attached Ruby callback is active either terminate safely or raise instead of deadlocking

• 0.21.2 - 11-06-2026

  • Add Context#perform_microtask_checkpoint to synchronously drain the V8 microtask queue, useful for spec-compliant dispatchEvent sequencing inside Ruby callbacks
  • Fix native memory leaks in Context#heap_snapshot/Context#write_heap_snapshot; thanks to Pranjali Thakur from depthfirst.com
  • Fix large integral JavaScript numbers wrapping to negative Ruby integers; thanks to Pranjali Thakur from depthfirst.com
  • Fix Ruby callback exceptions with embedded NUL bytes permanently deadlocking a context; thanks to Pranjali Thakur from depthfirst.com
  • Preserve embedded NUL bytes in JavaScript exception messages and attached function names, and reject unsafe V8 flags containing NUL bytes or overly long values

Commits

• da8e2b3 new release
• f525168 improve bench, allow for warmup
• 478c763 fix: avoid stale V8 termination on interrupts
• 5f135ec DEV: first pass of benchmark suite
• 0d76e94 FIX: harden single-threaded fork, dispose, and interrupt handling
• a9a874d test: stabilize heap stats warmup
• 215889b version bump
• 4fd4229 Correct truffle implementation
• a69e832 reduce noise in tests
• 4469082 FIX: preserve embedded NUL bytes
• Additional commits viewable in compare view

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