MSRV CI job fail to use cargo rust-version dependency resolution

[mockersf]

Objective

• CI fails because of a wrong MSRV issue

Solution

• cargo metadata creates a lock file with the current stable version, which is then used by the MSRV turns out cargo metadata --no-deps doesn't lock the lock file unlike cargo metadata
• clear the stable lock file
• also update the resolver to v3: https://doc.rust-lang.org/edition-guide/rust-2024/cargo-resolver.html

Testing

• CI