Latest release (v0.2.2) of xtensa-lx-rt-proc-macros not used by published xtensa-lx-rt

[AnthonyGrondin]

This due to the way the dependency is specificed; Rust treats it as a multiple locations dependency and will use version = "=0.2.1" whenever this crate is pulled from crates.io

macros = { version = "0.2.1", package = "xtensa-lx-rt-proc-macros", path = "./procmacros" }

When forcing the update using cargo update xtensa-lx-rt-proc-macros --precise 0.2.2, cargo fails with the following error:

    Updating crates.io index
error: failed to select a version for the requirement `xtensa-lx-rt-proc-macros = "=0.2.1"`
candidate versions found which didn't match: 0.2.2
location searched: crates.io index
required by package `xtensa-lx-rt v0.16.0`
    ... which satisfies dependency `xtensa-lx-rt = "^0.16.0"` (locked to 0.16.0) of package `esp-hal v0.19.0 (/esp-hal/esp-hal)`