Remove unneeded 'static lifetimes on &strs in constants (#8698)

This PR removes unneeded `'static` lifetimes on `&str`s stored in
`const` declarations.

This addresses some Clippy lints about
[`redundant_static_lifetimes`](https://rust-lang.github.io/rust-clippy/master/index.html#/redundant_static_lifetimes).

In item-level `const` declarations we can rely on lifetime elision and
use the default `'static` lifetime.

Note that associated constants still require an explicit `'static`
lifetime, as explained in
https://github.com/rust-lang/rust/issues/115010.

Release Notes:

- N/A

crates/vim/src/object.rs

@@ -835,7 +835,7 @@ mod test {
         test::{ExemptionFeatures, NeovimBackedTestContext, VimTestContext},
     };
 
-    const WORD_LOCATIONS: &'static str = indoc! {"
+    const WORD_LOCATIONS: &str = indoc! {"
         The quick ˇbrowˇnˇ•••
         fox ˇjuˇmpsˇ over
         the lazy dogˇ••