Upgrade Core to 84c6f450b2998a6558aef4174039a0fa427d9b5b

[jviotti]

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

[cubic-dev-ai]

No issues found across 5 files

[augmentcode]

🤖 Augment PR Summary

Summary: Updates the vendored sourcemeta/core dependency to commit 5d5098c….

Changes:

• Bumps the Core SHA in DEPENDENCIES to pull in upstream updates.
• Refactors URITemplateRouterView to load the serialized router into an in-memory byte buffer instead of relying on a memory-mapped FileView.
• Adds URITemplateRouterReadError to represent failures when opening/reading a router file.
• Removes the uritemplate CMake link dependency on sourcemeta::core::io, aligning build deps with the new implementation.

Technical Notes: Router matching now operates on a std::vector<std::uint8_t> backing store, so file I/O and bounds validation become the key correctness considerations.

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[augmentcode]

Review completed. 2 suggestions posted.

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