[fix] the suspicious use of OpenOptions::create() without an explicit OpenOptions::truncate().

[ramsayleung]

Description

Rust 1.77 introduces a new cargo clippy lint rule for the suspicious use of OpenOptions::create() without an explicit OpenOptions::truncate(), which failed the cargo clipy CI task

Motivation and Context

• https://rust-lang.github.io/rust-clippy/master/index.html#/suspicious_open_options
• https://github.com/ramsayleung/rspotify/actions/runs/8396555462/job/22998169454?pr=467

Dependencies

None

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How has this been tested?

• cargo clippy -p rspotify -p rspotify-http -p rspotify-model -p rspotify-macros --no-default-features --features=rspotify/cli,rspotify/env-file,rspotify/client-ureq,rspotify/ureq-rustls-tls,rspotify-http/client-ureq,rspotify-http/ureq-rustls-tls --all-targets -- -D warnings: passed
• All CI tasks passed

Is this change properly documented?

It's unnecessary.