`cargo upgrade` is bumping dependencies incompatible with specified rust version

[jaques-sam-tlv]

First things first, this is a great tool!!

My version is:

❯ cargo upgrade --version
cargo-edit-upgrade 0.13.8

Just having issues with the cargo upgrade command in a repository where we can't use a higher rust version than 1.82.

Our toolchain (rust-toolchain.toml) file looks like this:

[toolchain]
channel = "1.82.0"

When executing:
cargo upgrade and afterwards run the tests, we get:

❯ cargo test
error: rustc 1.82.0 is not supported by the following packages:
  icu_collections@2.1.1 requires rustc 1.83
  icu_locale_core@2.1.1 requires rustc 1.83
  icu_normalizer@2.1.1 requires rustc 1.83
  icu_normalizer_data@2.1.1 requires rustc 1.83
  icu_normalizer_data@2.1.1 requires rustc 1.83
  icu_normalizer_data@2.1.1 requires rustc 1.83
  icu_properties@2.1.1 requires rustc 1.83
  icu_properties_data@2.1.1 requires rustc 1.83
  icu_properties_data@2.1.1 requires rustc 1.83
  icu_properties_data@2.1.1 requires rustc 1.83
  icu_provider@2.1.1 requires rustc 1.83
Either upgrade rustc or select compatible dependency versions with
`cargo update <name>@<current-ver> --precise <compatible-ver>`
where `<compatible-ver>` is the latest version supporting rustc 1.82.0

This doesn't help either:
cargo upgrade --rust-version 1.82.0

This feels like a bug, the packages are clearly saying 1.82 is not supported, yet it's updating them.
Thanks for looking into it!

[epage]

Do you have reproduction steps?