Upgrade Core and Blaze to the latest versions

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[cubic-dev-ai]

No issues found across 85 files

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[augmentcode]

🤖 Augment PR Summary

Summary: This PR upgrades the vendored Core, Blaze, and JSONBinPack revisions.

Dependency updates:

• Adds mimalloc 3.4.4 to Core and enables it by default on Linux and macOS outside sanitizer builds.
• Moves sanitizer setup earlier in Blaze and JSONBinPack so newly created targets inherit it.
• Updates Core discovery in JSONBinPack to use the system allocator under sanitizers.

Core functionality:

• Adds a line-oriented Myers diff library with unified-diff rendering.
• Uses the diff library to improve multi-line test failure diagnostics.
• Expands process spawning with stdin, environment replacement, and captured stdout/stderr.
• Adds regex replacement support and reusable locale-independent integer formatting helpers.
• Extends YAML anchor/alias handling for mapping keys and adjusts embedded metaschema precedence.

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[augmentcode]

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