update toolchain to 2025-02-22

[tones111]

This change bumps the toolchain to a recent nightly that incorporates LLVM codegen improvements and avr-none target.

Much thanks to @Patryk27 for all your hard work

closes #537

[tones111]

I'd like to phone a friend (@Patryk27)

When I build locally I get an error like
/usr/bin/avr-ld: avr architecture of input file `/tmp/rustcyPlIoS/symbols.o' is incompatible with avr:51 output
which led me here and suggests a -mavr51 flag needs to be passed to the linker.

I'm not sure where symbols.o comes from. Maybe we need to (somehow) pass extra flags when building the core library?

It appears the avr-gcc on the CI system doesn't understand that flag

my versions

$ avr-gcc --version
avr-gcc (GCC) 14.2.0
$ avr-ld --version
GNU ld (GNU Binutils) 2.43

[Patryk27]

[...] suggests a -mavr51 flag needs to be passed to the linker.

Yes, this is supposed to be done automatically by rustc:

https://github.com/rust-lang/rust/blob/bb2cc59a2172d6e35c89b409a4e6b5058d9039d7/compiler/rustc_codegen_ssa/src/back/linker.rs#L580

I'll take a look later at what's going on here!

[Patryk27]

shouldn't we have something like --target=avr-none -C target-cpu={{matrix.something}} in here?