build(deps): update `rust-embed` to 8.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rust-embed	dependencies	minor	8.1.0 -> 8.4.0

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Release Notes

pyros2097/rust-embed (rust-embed)

v8.4.0

• Re-export RustEmbed as Embed #​245. Thanks to pyrossh
• Do not build glob matchers repeatedly when include-exclude feature is enabled #​244. Thanks to osiewicz
• Add metadata_only attribute #​241. Thanks to ddfisher
• Replace expect with a safer alternative that returns None instead #​240. Thanks to costinsin
• Eliminate unnecessary to_path call #​239. Thanks to smoelius

v8.3.0

• Fix symbolic links in debug builds #​235. Thanks to Buckram123

v8.2.0

• Fix naming collisions in macros #​230. Thanks to hwittenborn

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