`az` version limit conflicts with next version of `embassy-rp`

`embedded-graphics` contains an [upper limit](https://github.com/embedded-graphics/embedded-graphics/blob/59fd64be61167682e9b3fe8e73d02c431c87b25a/Cargo.toml#L31C1-L31C14) on the `az` version:
```toml
az = "~1.2.0"
```

This can conflict with other packages that require newer versions. For example, the current git code in `embassy-rp` contains a dependency on `fixed 1.31.0`, which requires `az 1.3`.

To reproduce:
```plaintext
cargo new --lib embedded-broken; cd embedded-broken
cargo add embassy-rp --git https://github.com/embassy-rs/embassy.git
cargo add embedded-graphics

error: failed to select a version for `az`.
... required by package `embedded-graphics v0.8.2`
... which satisfies dependency `embedded-graphics = "^0.8.2"` of package `embedded-broken v0.1.0 (/home/eric/work/rust/play/embedded-broken)`
versions that meet the requirements `~1.2.0` are: 1.2.1, 1.2.0

all possible versions conflict with previously selected packages

previously selected package `az v1.3.0`
... which satisfies dependency `az = "^1.3"` of package `fixed v1.31.0`
... which satisfies dependency `fixed = "^1.31.0"` of package `embassy-rp v0.10.0 (https://github.com/embassy-rs/embassy.git#f21d63db)`
... which satisfies git dependency `embassy-rp` (locked to 0.10.0) of package `embedded-broken v0.1.0 (/home/eric/work/rust/play/embedded-broken)`

failed to select a version for `az` which could resolve this conflict
```

[That change to embassy-rp](https://github.com/embassy-rs/embassy/pull/6375) hasn't been released yet, but when it is the conflict will affect anyone using both embassy-rp and embedded-graphics.

I'm not sure why `az 1.3.x` is not currently permitted by embedded-graphics (the limit was added in #809) , but it would make life easier if the upper limit could be removed so any semver-compatible `az` version would be allowed.

Start in Cargo.toml at the az dependency limit linked in the issue, and review the rationale from issue or pull request #809. Reproduce the dependency resolution failure with the provided cargo new, cargo add embassy-rp, and cargo add embedded-graphics commands. Done means the example resolves with the newer az version permitted.

Written by the indexing model from the issue text.