Update Rust crate defmt-rtt to v1.3.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
defmt-rtt	dependencies	minor	1.0.0 → 1.3.0

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Release Notes

knurling-rs/defmt (defmt-rtt)

v1.3.0

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• [#​1053] Add the drop-on-contention feature to trade low interrupt latency for reliable RTT delivery

v1.2.0

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• [#​1006] Fix available_buffer_size ignoring available buffer space when read < write
• [#​1013] Switch to fixed 32-bit types, to support 64-bit targets

v1.1.0

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• [#​974] Ensure typechecking is still performed on disabled log statement.
• [#​960] Fix Format not accepting multiple helper attribute instances
• [#​937] add support for #[defmt(transparent)] on Format derive
• [#​959] Missing "unstable-test" cfg in tests module
• [#​956] Link LICENSE-* in the crate folder
• [#​955] Allow using the defmt/alloc feature on bare metal ESP32-S2
• [#​972] Fix logic bug in env_filter
• [#​1007] defmt: impl Format for core::fmt::Error
• [#​983] Add Format implementation for core::num::Wrapping<T>
• [#​1022] Re-fix accidental breaking change in Format macro
• [#​1041] Ignore RUSTSEC-2026-0009
• [#​1052] Pin UI tests to host MSRV

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