`[profile.release] strip = "symbols"` in Cargo.toml is not honored

```sh
$ rustc --version
rustc 1.59.0 (9d1b2106e 2022-02-23)
```

My `Cargo.toml`:

```toml
[profile.release]
strip = "symbols"
```

```sh
./run-script ../scripts/18-make-deb-package
cargo-deb: unable to parse Cargo.toml
  because: invalid type: string "symbols", expected a boolean for key `profile.release.strip` at line 23 column 9
```