fix: solve lint issues

[0xWOF]

On rust 1.65.0, main branch of redis-rs can not pass lint workflow.
Solved issues is

• explicit-auto-deref
• bool-to-int-with-if
• needless-borrow

[djc]

Wow, that was quick! Thanks for cleaning these up!

[0xWOF]

it is weird that this PR is pass (7.0.0, nightly) test on my repository, but not on here.
https://github.com/0xWOF/redis-rs/actions/runs/3387016797/jobs/5627179494.

I think that it is timing issue of test code, if con.set is executed slowly on ci machine, it can do not pass the test.
How about your thoughts?

    let ctx = TestContext::new();
    let mut con = ctx.connection();

    let _: () = con.set("object_key_str", "object_value_str").unwrap();
    let _: () = con.set("object_key_int", 42).unwrap();

    assert_eq!(
        con.object_encoding::<_, String>("object_key_str").unwrap(),
        "embstr"
    );

    assert_eq!(
        con.object_encoding::<_, String>("object_key_int").unwrap(),
        "int"
    );

    assert_eq!(con.object_idletime::<_, i32>("object_key_str").unwrap(), 0); // do not pass here!

[djc]

Looks like that test failed intermittently, since it worked on the second try.