panic! macro should be an expression returning ! (Never type)

[Dirbaio]

Code like this fails to compile, while it compiles with std panic!().

    let foo: u32 = match version {
        4 => 123,
        5 => 456,
        _ => defmt::panic!("unknown version {:?}", version),
    };

error: macro expansion ignores token `;` and any following
  --> firmware/qemu/src/bin/panic.rs:14:14
   |
14 |         _ => defmt::panic!("unknown version {:?}", version),
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^- help: you might be missing a semicolon here: `;`
   |              |
   |              caused by the macro expansion here
   |
   = note: the usage of `defmt::panic!` is likely invalid in expression context

error[E0308]: mismatched types
  --> firmware/qemu/src/bin/panic.rs:14:14
   |
14 |         _ => defmt::panic!("unknown version {:?}", version),
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `u32`, found `()`
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)