rust-cli / config-rs / 17104337609

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refactor: Remove `add_dummy_extension()` helper (#682)

The helper method is redundant (_introduced as a [bug fix in Mar
2022](https://github.com/rust-cli/config-rs/pull/306)_), there is a much
simpler approach to append the extension.

-
[`as_mut_os_string()`](https://doc.rust-lang.org/std/path/struct.Path.html#method.as_mut_os_str)
has been available since Rust `1.70.0`, matching the MSRV of this crate
since the introduction of
[`OnceLock`](https://doc.rust-lang.org/std/sync/struct.OnceLock.html)
[in Oct 2024](https://github.com/rust-cli/config-rs/pull/515) (_`0.14.1`
release_).
- Additionally revised the comment and included a conditional statement
to better communicate the intent for why this placeholder is necessary.

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