feat: bump oniguruma-to-es for grammar support and perf

[slevithan]

Updates oniguruma-to-es to v0.6.0, and makes corresponding changes.

• Option accuracy: 'loose' replaced by rules.allowUnhandledGAnchors.
  • Now implicitly using accuracy: 'default'.
• Option tmGrammar replaced by rules.allowOrphanBackrefs.
• Applied new option rules.asciiWordBoundaries for performance, since Unicode-based word boundaries are rarely needed, and the complex Unicode form for them is meaningfully slower.
  • This change doesn't alter results in the JS engine report.
• An edge-case fix in the new version results in the number of supported grammars increasing by +1.

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[antfu]

Impressive! Thanks a lot!