scripts/cargo_deny.sh fails to install cargo-deny because of an MSRV error

[dataphract]

Describe the bug
While running scripts/cargo_deny.sh, if cargo-deny is not already installed, the step that attempts to install it fails because the latest cargo-deny has an MSRV of 1.74, while the rust-toolchain file sets the toolchain to 1.72, and this affects cargo install.

$ cargo install cargo-deny
    Updating crates.io index
  Installing cargo-deny v0.14.21
    Updating crates.io index

error: failed to compile `cargo-deny v0.14.21`, intermediate artifacts can be found at `/tmp/cargo-installv5Hzhx`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.

Caused by:
  package `clap_builder v4.5.2` cannot be built because it requires rustc 1.74 or newer, while the currently active rustc version is 1.72.0
  Try re-running cargo install with `--locked`

To Reproduce
Steps to reproduce the behavior:

1. Uninstall cargo-deny if it is already installed.
2. From the repository root, run cargo install cargo-deny.

Expected behavior
cargo-deny should install without error.

Desktop (please complete the following information):

• OS: Arch Linux
• Browser: N/A
• Version: N/A

[YgorSouza]

I tried to fix that in #4293 by adding the +stable argument. I'll try to finish that PR and open it up for review.