feat: support rust 1.81.0

[ognevny]

Description

• features fs_try_exists and panic_info_message are stable
• fs::try_exists is now fs::exists
• PanicInfo is now PanicHookInfo (use to_string method for it)
• switch to 1.81.0-nightly in rust-toolchain.toml

Testing Instructions

cargo test to ensure the code has the same behavior as before

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[ijjk]

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[ognevny]

should be clippy fixes be pushed along with this change?

[chris-olszewski]

should be clippy fixes be pushed along with this change?

If you could do that, it would be very much appreciated. It looks like those lints just got added.

[chris-olszewski]

Thanks for the PR! Looks good to me, the new clippy lints just need to be fixed.

[ognevny]

done, fixed all errors and warnings