Workflow fails because the rustc version is too old

I have a scrunkly little project that I tried setting up a GH action for. Yesterday, it worked using rust 1.77.2, but it keeps failing now that I set the project's `rust-version` to `1.78.0`:

```
error: package `realpha v1.0.2 (/Users/runner/work/realpha/realpha)` cannot be built because it requires rustc 1.78.0 or newer, while the currently active rustc version is 1.77.2
```

Rust 1.78 basically *just* came out. Is this a situation where I just have to wait for something upstream to get updated or is this something I can fix?

All the relevant files are here: [release.yml](https://github.com/SamusAranX/realpha/blob/4faea3219ae20b3a984c18cb732eb932459b93cf/.github/workflows/release.yml), [Cargo.toml](https://github.com/SamusAranX/realpha/blob/4faea3219ae20b3a984c18cb732eb932459b93cf/Cargo.toml)

Start with .github/workflows/release.yml and Cargo.toml, comparing the workflow's selected rustc version with the project's rust-version setting. Trace where rustc 1.77.2 is chosen and check whether the workflow can use Rust 1.78.0 or newer. Done means the release workflow builds the project without the reported compiler-version error.

Written by the indexing model from the issue text.